[
  {
    "number": 1,
    "symbol": "H",
    "english": "Hydrogen",
    "slug": "hydrogen",
    "group": 1,
    "period": 1,
    "x": 1,
    "y": 1,
    "block": "s",
    "category": "diatomic nonmetal",
    "mass": 1.008,
    "shells": [
      1
    ],
    "configuration": "1s1",
    "fullConfiguration": "1s1",
    "electronegativity": 2.2,
    "ionization": 1312,
    "melt": 13.99,
    "boil": 20.271,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/hydrogen.webp",
      "title": "Vial of glowing ultrapure hydrogen, H2. Original size in cm: 1 x 5",
      "attribution": "User:Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/hydrogen.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/d/d9/Hydrogenglow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/1/hydrogen"
  },
  {
    "number": 2,
    "symbol": "He",
    "english": "Helium",
    "slug": "helium",
    "group": 18,
    "period": 1,
    "x": 18,
    "y": 1,
    "block": "s",
    "category": "noble gas",
    "mass": 4.0026022,
    "shells": [
      2
    ],
    "configuration": "1s2",
    "fullConfiguration": "1s2",
    "electronegativity": null,
    "ionization": 2372.3,
    "melt": null,
    "boil": 4.222,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/helium.webp",
      "title": "Vial of glowing ultrapure helium. Original size in cm: 1 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/helium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/00/Helium-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/2/helium"
  },
  {
    "number": 3,
    "symbol": "Li",
    "english": "Lithium",
    "slug": "lithium",
    "group": 1,
    "period": 2,
    "x": 1,
    "y": 2,
    "block": "s",
    "category": "alkali metal",
    "mass": 6.94,
    "shells": [
      2,
      1
    ],
    "configuration": "[He] 2s1",
    "fullConfiguration": "1s2 2s1",
    "electronegativity": 0.98,
    "ionization": 520.2,
    "melt": 453.65,
    "boil": 1603,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/lithium.webp",
      "title": "0.5 Grams Lithium under Argon. Original size of the largest piece in cm: 0.3 x 4",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/lithium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/e2/0.5_grams_lithium_under_argon.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/3/lithium"
  },
  {
    "number": 4,
    "symbol": "Be",
    "english": "Beryllium",
    "slug": "beryllium",
    "group": 2,
    "period": 2,
    "x": 2,
    "y": 2,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 9.01218315,
    "shells": [
      2,
      2
    ],
    "configuration": "[He] 2s2",
    "fullConfiguration": "1s2 2s2",
    "electronegativity": 1.57,
    "ionization": 899.5,
    "melt": 1560,
    "boil": 2742,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/beryllium.webp",
      "title": "Pure Beryllium bead, 2.5 grams. Original size in cm: 1 x 1.5",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/beryllium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/e2/Beryllium_%28Be%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/4/beryllium"
  },
  {
    "number": 5,
    "symbol": "B",
    "english": "Boron",
    "slug": "boron",
    "group": 13,
    "period": 2,
    "x": 13,
    "y": 2,
    "block": "p",
    "category": "metalloid",
    "mass": 10.81,
    "shells": [
      2,
      3
    ],
    "configuration": "[He] 2s2 2p1",
    "fullConfiguration": "1s2 2s2 2p1",
    "electronegativity": 2.04,
    "ionization": 800.6,
    "melt": 2349,
    "boil": 4200,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/boron.webp",
      "title": "Pure Crystalline Boron, front and back side. Original size in cm: 2 x 3",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/boron.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a2/Boron.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/5/boron"
  },
  {
    "number": 6,
    "symbol": "C",
    "english": "Carbon",
    "slug": "carbon",
    "group": 14,
    "period": 2,
    "x": 14,
    "y": 2,
    "block": "p",
    "category": "polyatomic nonmetal",
    "mass": 12.011,
    "shells": [
      2,
      4
    ],
    "configuration": "[He] 2s2 2p2",
    "fullConfiguration": "1s2 2s2 2p2",
    "electronegativity": 2.55,
    "ionization": 1086.5,
    "melt": null,
    "boil": null,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/carbon.webp",
      "title": "Element 6 - Carbon",
      "attribution": "Texas Lane, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/68/Pure_Carbon.png"
    },
    "source": "https://periodic-table.rsc.org/element/6/carbon"
  },
  {
    "number": 7,
    "symbol": "N",
    "english": "Nitrogen",
    "slug": "nitrogen",
    "group": 15,
    "period": 2,
    "x": 15,
    "y": 2,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 14.007,
    "shells": [
      2,
      5
    ],
    "configuration": "[He] 2s2 2p3",
    "fullConfiguration": "1s2 2s2 2p3",
    "electronegativity": 3.04,
    "ionization": 1402.3,
    "melt": 63.15,
    "boil": 77.355,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/nitrogen.webp",
      "title": "Vial of Glowing Ultrapure Nitrogen, N2. Original size in cm: 1 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/nitrogen.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/2d/Nitrogen-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/7/nitrogen"
  },
  {
    "number": 8,
    "symbol": "O",
    "english": "Oxygen",
    "slug": "oxygen",
    "group": 16,
    "period": 2,
    "x": 16,
    "y": 2,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 15.999,
    "shells": [
      2,
      6
    ],
    "configuration": "[He] 2s2 2p4",
    "fullConfiguration": "1s2 2s2 2p4",
    "electronegativity": 3.44,
    "ionization": 1313.9,
    "melt": 54.36,
    "boil": 90.188,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/oxygen.webp",
      "title": "Liquid Oxygen in a Beaker",
      "attribution": "Staff Sgt. Nika Glover, U.S. Air Force, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a0/Liquid_oxygen_in_a_beaker_%28cropped_and_retouched%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/8/oxygen"
  },
  {
    "number": 9,
    "symbol": "F",
    "english": "Fluorine",
    "slug": "fluorine",
    "group": 17,
    "period": 2,
    "x": 17,
    "y": 2,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 18.9984031636,
    "shells": [
      2,
      7
    ],
    "configuration": "[He] 2s2 2p5",
    "fullConfiguration": "1s2 2s2 2p5",
    "electronegativity": 3.98,
    "ionization": 1681,
    "melt": 53.48,
    "boil": 85.03,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/fluorine.webp",
      "title": "Liquid Fluorine at -196°C",
      "attribution": "Fulvio314, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/2c/Fluoro_liquido_a_-196%C2%B0C_1.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/9/fluorine"
  },
  {
    "number": 10,
    "symbol": "Ne",
    "english": "Neon",
    "slug": "neon",
    "group": 18,
    "period": 2,
    "x": 18,
    "y": 2,
    "block": "p",
    "category": "noble gas",
    "mass": 20.17976,
    "shells": [
      2,
      8
    ],
    "configuration": "[He] 2s2 2p6",
    "fullConfiguration": "1s2 2s2 2p6",
    "electronegativity": null,
    "ionization": 2080.7,
    "melt": 24.56,
    "boil": 27.104,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/neon.webp",
      "title": "Vial of Glowing Ultrapure neon. Original size in cm: 1 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/neon.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f8/Neon-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/10/neon"
  },
  {
    "number": 11,
    "symbol": "Na",
    "english": "Sodium",
    "slug": "sodium",
    "group": 1,
    "period": 3,
    "x": 1,
    "y": 3,
    "block": "s",
    "category": "alkali metal",
    "mass": 22.989769282,
    "shells": [
      2,
      8,
      1
    ],
    "configuration": "[Ne] 3s1",
    "fullConfiguration": "1s2 2s2 2p6 3s1",
    "electronegativity": 0.93,
    "ionization": 495.8,
    "melt": 370.944,
    "boil": 1156.09,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/sodium.webp",
      "title": "Na (Sodium) Metal",
      "attribution": "The original uploader was Dnn87 at English Wikipedia., CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/27/Na_%28Sodium%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/11/sodium"
  },
  {
    "number": 12,
    "symbol": "Mg",
    "english": "Magnesium",
    "slug": "magnesium",
    "group": 2,
    "period": 3,
    "x": 2,
    "y": 3,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 24.305,
    "shells": [
      2,
      8,
      2
    ],
    "configuration": "[Ne] 3s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2",
    "electronegativity": 1.31,
    "ionization": 737.7,
    "melt": 923,
    "boil": 1363,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/magnesium.webp",
      "title": "Magnesium crystals",
      "attribution": "Warut Roonguthai, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/3/3f/Magnesium_crystals.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/12/magnesium"
  },
  {
    "number": 13,
    "symbol": "Al",
    "english": "Aluminium",
    "slug": "aluminium",
    "group": 13,
    "period": 3,
    "x": 13,
    "y": 3,
    "block": "p",
    "category": "post-transition metal",
    "mass": 26.98153857,
    "shells": [
      2,
      8,
      3
    ],
    "configuration": "[Ne] 3s2 3p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p1",
    "electronegativity": 1.61,
    "ionization": 577.5,
    "melt": 933.47,
    "boil": 2743,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/aluminium.webp",
      "title": "Pure aluminium foil. Original size in cm: 5 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/aluminium.php ",
      "original": "https://upload.wikimedia.org/wikipedia/commons/3/3e/Aluminium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/13/aluminium"
  },
  {
    "number": 14,
    "symbol": "Si",
    "english": "Silicon",
    "slug": "silicon",
    "group": 14,
    "period": 3,
    "x": 14,
    "y": 3,
    "block": "p",
    "category": "metalloid",
    "mass": 28.085,
    "shells": [
      2,
      8,
      4
    ],
    "configuration": "[Ne] 3s2 3p2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p2",
    "electronegativity": 1.9,
    "ionization": 786.5,
    "melt": 1687,
    "boil": 3538,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/silicon.webp",
      "title": "Chunk of Ultrapure Silicon, 2 x 2 cm",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/silicon.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/2c/Silicon.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/14/silicon"
  },
  {
    "number": 15,
    "symbol": "P",
    "english": "Phosphorus",
    "slug": "phosphorus",
    "group": 15,
    "period": 3,
    "x": 15,
    "y": 3,
    "block": "p",
    "category": "polyatomic nonmetal",
    "mass": 30.9737619985,
    "shells": [
      2,
      8,
      5
    ],
    "configuration": "[Ne] 3s2 3p3",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p3",
    "electronegativity": 2.19,
    "ionization": 1011.8,
    "melt": null,
    "boil": null,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/phosphorus.webp",
      "title": "Purple Phosphorus",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/phosphorus.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/6d/Phosphorus-purple.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/15/phosphorus"
  },
  {
    "number": 16,
    "symbol": "S",
    "english": "Sulfur",
    "slug": "sulfur",
    "group": 16,
    "period": 3,
    "x": 16,
    "y": 3,
    "block": "p",
    "category": "polyatomic nonmetal",
    "mass": 32.06,
    "shells": [
      2,
      8,
      6
    ],
    "configuration": "[Ne] 3s2 3p4",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p4",
    "electronegativity": 2.58,
    "ionization": 999.6,
    "melt": 388.36,
    "boil": 717.8,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/sulfur.webp",
      "title": "Native Sulfur From Russia",
      "attribution": "James St. John, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/23/Native_sulfur_%28Vodinskoe_Deposit%3B_quarry_near_Samara%2C_Russia%29_9.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/16/sulfur"
  },
  {
    "number": 17,
    "symbol": "Cl",
    "english": "Chlorine",
    "slug": "chlorine",
    "group": 17,
    "period": 3,
    "x": 17,
    "y": 3,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 35.45,
    "shells": [
      2,
      8,
      7
    ],
    "configuration": "[Ne] 3s2 3p5",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p5",
    "electronegativity": 3.16,
    "ionization": 1251.2,
    "melt": 171.6,
    "boil": 239.11,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/chlorine.webp",
      "title": "A Sample of Chlorine",
      "attribution": "Benjah-bmm27, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/9/9a/Chlorine-sample-flip.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/17/chlorine"
  },
  {
    "number": 18,
    "symbol": "Ar",
    "english": "Argon",
    "slug": "argon",
    "group": 18,
    "period": 3,
    "x": 18,
    "y": 3,
    "block": "p",
    "category": "noble gas",
    "mass": 39.9481,
    "shells": [
      2,
      8,
      8
    ],
    "configuration": "[Ne] 3s2 3p6",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6",
    "electronegativity": null,
    "ionization": 1520.6,
    "melt": 83.81,
    "boil": 87.302,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/argon.webp",
      "title": "Vial of glowing ultrapure argon. Original size in cm: 1 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/argon.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/53/Argon-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/18/argon"
  },
  {
    "number": 19,
    "symbol": "K",
    "english": "Potassium",
    "slug": "potassium",
    "group": 1,
    "period": 4,
    "x": 1,
    "y": 4,
    "block": "s",
    "category": "alkali metal",
    "mass": 39.09831,
    "shells": [
      2,
      8,
      8,
      1
    ],
    "configuration": "[Ar] 4s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s1",
    "electronegativity": 0.82,
    "ionization": 418.8,
    "melt": 336.7,
    "boil": 1032,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/potassium.webp",
      "title": "Potassium Pieces",
      "attribution": "Dnn87, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/b3/Potassium.JPG"
    },
    "source": "https://periodic-table.rsc.org/element/19/potassium"
  },
  {
    "number": 20,
    "symbol": "Ca",
    "english": "Calcium",
    "slug": "calcium",
    "group": 2,
    "period": 4,
    "x": 2,
    "y": 4,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 40.0784,
    "shells": [
      2,
      8,
      8,
      2
    ],
    "configuration": "[Ar] 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2",
    "electronegativity": 1,
    "ionization": 589.8,
    "melt": 1115,
    "boil": 1757,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/calcium.webp",
      "title": "Calcium Grains, grain size about 1 mm",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/calcium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/7/72/Calcium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/20/calcium"
  },
  {
    "number": 21,
    "symbol": "Sc",
    "english": "Scandium",
    "slug": "scandium",
    "group": 3,
    "period": 4,
    "x": 3,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 44.9559085,
    "shells": [
      2,
      8,
      9,
      2
    ],
    "configuration": "[Ar] 3d1 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d1",
    "electronegativity": 1.36,
    "ionization": 633.1,
    "melt": 1814,
    "boil": 3109,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/scandium.webp",
      "title": "Crystal of Scandium. About 1g",
      "attribution": "JanDerChemiker, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f5/Scandium%2C_Sc.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/21/scandium"
  },
  {
    "number": 22,
    "symbol": "Ti",
    "english": "Titanium",
    "slug": "titanium",
    "group": 4,
    "period": 4,
    "x": 4,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 47.8671,
    "shells": [
      2,
      8,
      10,
      2
    ],
    "configuration": "[Ar] 3d2 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d2",
    "electronegativity": 1.54,
    "ionization": 658.8,
    "melt": 1941,
    "boil": 3560,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/titanium.webp",
      "title": "Titanium Crystal made with the van Arkel-de Booer Process. 87 grams, Original size in cm: 2.5 x 4",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/titanium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/ec/Titanium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/22/titanium"
  },
  {
    "number": 23,
    "symbol": "V",
    "english": "Vanadium",
    "slug": "vanadium",
    "group": 5,
    "period": 4,
    "x": 5,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 50.94151,
    "shells": [
      2,
      8,
      11,
      2
    ],
    "configuration": "[Ar] 3d3 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d3",
    "electronegativity": 1.63,
    "ionization": 650.9,
    "melt": 2183,
    "boil": 3680,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/vanadium.webp",
      "title": "Pieces of Pure Vanadium with Oxide Layer",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/vanadium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/0a/Vanadium-pieces.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/23/vanadium"
  },
  {
    "number": 24,
    "symbol": "Cr",
    "english": "Chromium",
    "slug": "chromium",
    "group": 6,
    "period": 4,
    "x": 6,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 51.99616,
    "shells": [
      2,
      8,
      13,
      1
    ],
    "configuration": "[Ar] 3d5 4s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s1 3d5",
    "electronegativity": 1.66,
    "ionization": 652.9,
    "melt": 2180,
    "boil": 2944,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/chromium.webp",
      "title": "Piece of Chromium Metal",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/chromium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a1/Chromium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/24/chromium"
  },
  {
    "number": 25,
    "symbol": "Mn",
    "english": "Manganese",
    "slug": "manganese",
    "group": 7,
    "period": 4,
    "x": 7,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 54.9380443,
    "shells": [
      2,
      8,
      13,
      2
    ],
    "configuration": "[Ar] 3d5 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d5",
    "electronegativity": 1.55,
    "ionization": 717.3,
    "melt": 1519,
    "boil": 2334,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/manganese.webp",
      "title": "Two Oieces of Manganese Metal",
      "attribution": "W. Oelen, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/64/Manganese_element.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/25/manganese"
  },
  {
    "number": 26,
    "symbol": "Fe",
    "english": "Iron",
    "slug": "iron",
    "group": 8,
    "period": 4,
    "x": 8,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 55.8452,
    "shells": [
      2,
      8,
      14,
      2
    ],
    "configuration": "[Ar] 3d6 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d6",
    "electronegativity": 1.83,
    "ionization": 762.5,
    "melt": 1811,
    "boil": 3134,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/iron.webp",
      "title": "Fragments of an iron meteorite, about 92% iron. Original size of the single pieces in cm: 0.4 - 0.8",
      "attribution": "Chemical ELements A Virtual Museum, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0> source: https://images-of-elements.com/iron.php",
      "original": "https://images-of-elements.com/iron-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/26/iron"
  },
  {
    "number": 27,
    "symbol": "Co",
    "english": "Cobalt",
    "slug": "cobalt",
    "group": 9,
    "period": 4,
    "x": 9,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 58.9331944,
    "shells": [
      2,
      8,
      15,
      2
    ],
    "configuration": "[Ar] 3d7 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d7",
    "electronegativity": 1.88,
    "ionization": 760.4,
    "melt": 1768,
    "boil": 3200,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/cobalt.webp",
      "title": "Fractions from a cobalt, 7 and 4 grams. Original size in cm: 2 x 2",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/cobalt.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/62/Cobalt_ore_2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/27/cobalt"
  },
  {
    "number": 28,
    "symbol": "Ni",
    "english": "Nickel",
    "slug": "nickel",
    "group": 10,
    "period": 4,
    "x": 10,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 58.69344,
    "shells": [
      2,
      8,
      16,
      2
    ],
    "configuration": "[Ar] 3d8 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d8",
    "electronegativity": 1.91,
    "ionization": 737.1,
    "melt": 1728,
    "boil": 3003,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/nickel.webp",
      "title": "Nickel Chunk",
      "attribution": "Materialscientist at English Wikipedia, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/57/Nickel_chunk.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/28/nickel"
  },
  {
    "number": 29,
    "symbol": "Cu",
    "english": "Copper",
    "slug": "copper",
    "group": 11,
    "period": 4,
    "x": 11,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 63.5463,
    "shells": [
      2,
      8,
      18,
      1
    ],
    "configuration": "[Ar] 3d10 4s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s1 3d10",
    "electronegativity": 1.9,
    "ionization": 745.5,
    "melt": 1357.77,
    "boil": 2835,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/copper.webp",
      "title": "Macro of Native Copper about 1 ½ inches (4 cm) in size",
      "attribution": "Native_Copper_Macro_Digon3.jpg: 'Jonathan Zander (Digon3)' derivative work: Materialscientist, CC BY-SA 2.5 <https://creativecommons.org/licenses/by-sa/2.5>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f0/NatCopper.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/29/copper"
  },
  {
    "number": 30,
    "symbol": "Zn",
    "english": "Zinc",
    "slug": "zinc",
    "group": 12,
    "period": 4,
    "x": 12,
    "y": 4,
    "block": "d",
    "category": "transition metal",
    "mass": 65.382,
    "shells": [
      2,
      8,
      18,
      2
    ],
    "configuration": "[Ar] 3d10 4s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10",
    "electronegativity": 1.65,
    "ionization": 906.4,
    "melt": 692.68,
    "boil": 1180,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/zinc.webp",
      "title": "30 grams Zinc, front and back side. Original size in cm: 3",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/zinc.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/ba/Zinc_%2830_Zn%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/30/zinc"
  },
  {
    "number": 31,
    "symbol": "Ga",
    "english": "Gallium",
    "slug": "gallium",
    "group": 13,
    "period": 4,
    "x": 13,
    "y": 4,
    "block": "p",
    "category": "post-transition metal",
    "mass": 69.7231,
    "shells": [
      2,
      8,
      18,
      3
    ],
    "configuration": "[Ar] 3d10 4s2 4p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1",
    "electronegativity": 1.81,
    "ionization": 578.8,
    "melt": 302.9146,
    "boil": 2673,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/gallium.webp",
      "title": "Solid gallium, fresh and after some time (2 months) at room temperature",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/gallium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/b1/Solid_gallium_%28Ga%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/31/gallium"
  },
  {
    "number": 32,
    "symbol": "Ge",
    "english": "Germanium",
    "slug": "germanium",
    "group": 14,
    "period": 4,
    "x": 14,
    "y": 4,
    "block": "p",
    "category": "metalloid",
    "mass": 72.6308,
    "shells": [
      2,
      8,
      18,
      4
    ],
    "configuration": "[Ar] 3d10 4s2 4p2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2",
    "electronegativity": 2.01,
    "ionization": 762,
    "melt": 1211.4,
    "boil": 3106,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/germanium.webp",
      "title": "12 Grams Polycrystalline Germanium, 2*3 cm",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/germanium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/08/Polycrystalline-germanium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/32/germanium"
  },
  {
    "number": 33,
    "symbol": "As",
    "english": "Arsenic",
    "slug": "arsenic",
    "group": 15,
    "period": 4,
    "x": 15,
    "y": 4,
    "block": "p",
    "category": "metalloid",
    "mass": 74.9215956,
    "shells": [
      2,
      8,
      18,
      5
    ],
    "configuration": "[Ar] 3d10 4s2 4p3",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3",
    "electronegativity": 2.18,
    "ionization": 947,
    "melt": null,
    "boil": null,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/arsenic.webp",
      "title": "Ultrapure Metallic Arsenic under Argon, 1 - 2 grams. Original size of each piece in cm: 0.5 x 1",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/arsenic.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/3/3b/Arsenic_%2833_As%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/33/arsenic"
  },
  {
    "number": 34,
    "symbol": "Se",
    "english": "Selenium",
    "slug": "selenium",
    "group": 16,
    "period": 4,
    "x": 16,
    "y": 4,
    "block": "p",
    "category": "polyatomic nonmetal",
    "mass": 78.9718,
    "shells": [
      2,
      8,
      18,
      6
    ],
    "configuration": "[Ar] 3d10 4s2 4p4",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4",
    "electronegativity": 2.55,
    "ionization": 941,
    "melt": 494,
    "boil": 958,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/selenium.webp",
      "title": "Ultrapure Black, Amorphous Selenium, 3 - 4 grams. Original size in cm: 2",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/selenium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/7/7f/Selenium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/34/selenium"
  },
  {
    "number": 35,
    "symbol": "Br",
    "english": "Bromine",
    "slug": "bromine",
    "group": 17,
    "period": 4,
    "x": 17,
    "y": 4,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 79.904,
    "shells": [
      2,
      8,
      18,
      7
    ],
    "configuration": "[Ar] 3d10 4s2 4p5",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5",
    "electronegativity": 2.96,
    "ionization": 1139.9,
    "melt": 265.8,
    "boil": 332,
    "phase": "Liquid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/bromine.webp",
      "title": "99.5 % pure liquid Bromine in a 4 x 1 cm big glass ampoule, cast in acrylic",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/bromine.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/8/87/Bromine-ampoule.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/35/bromine"
  },
  {
    "number": 36,
    "symbol": "Kr",
    "english": "Krypton",
    "slug": "krypton",
    "group": 18,
    "period": 4,
    "x": 18,
    "y": 4,
    "block": "p",
    "category": "noble gas",
    "mass": 83.7982,
    "shells": [
      2,
      8,
      18,
      8
    ],
    "configuration": "[Ar] 3d10 4s2 4p6",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6",
    "electronegativity": 3,
    "ionization": 1350.8,
    "melt": 115.78,
    "boil": 119.93,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/krypton.webp",
      "title": "Vial of Glowing Ultrapure Krypton. Original size in cm: 1 x 5.",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/krypton.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/9/9c/Krypton-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/36/krypton"
  },
  {
    "number": 37,
    "symbol": "Rb",
    "english": "Rubidium",
    "slug": "rubidium",
    "group": 1,
    "period": 5,
    "x": 1,
    "y": 5,
    "block": "s",
    "category": "alkali metal",
    "mass": 85.46783,
    "shells": [
      2,
      8,
      18,
      8,
      1
    ],
    "configuration": "[Kr] 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1",
    "electronegativity": 0.82,
    "ionization": 403,
    "melt": 312.45,
    "boil": 961,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/rubidium.webp",
      "title": "Rubidium Metal Sample",
      "attribution": "Dnn87, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c9/Rb5.JPG"
    },
    "source": "https://periodic-table.rsc.org/element/37/rubidium"
  },
  {
    "number": 38,
    "symbol": "Sr",
    "english": "Strontium",
    "slug": "strontium",
    "group": 2,
    "period": 5,
    "x": 2,
    "y": 5,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 87.621,
    "shells": [
      2,
      8,
      18,
      8,
      2
    ],
    "configuration": "[Kr] 5s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2",
    "electronegativity": 0.95,
    "ionization": 549.5,
    "melt": 1050,
    "boil": 1650,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/strontium.webp",
      "title": "Strontium Pieces under Paraffin Oil.",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/strontium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/8/84/Strontium-1.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/38/strontium"
  },
  {
    "number": 39,
    "symbol": "Y",
    "english": "Yttrium",
    "slug": "yttrium",
    "group": 3,
    "period": 5,
    "x": 3,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 88.905842,
    "shells": [
      2,
      8,
      18,
      9,
      2
    ],
    "configuration": "[Kr] 4d1 5s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d1",
    "electronegativity": 1.22,
    "ionization": 600,
    "melt": 1799,
    "boil": 3203,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/yttrium.webp",
      "title": "6,21g Yttrium, Reinheit mindestens 99%.",
      "attribution": "Jan Anskeit, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/9/90/Piece_of_Yttrium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/39/yttrium"
  },
  {
    "number": 40,
    "symbol": "Zr",
    "english": "Zirconium",
    "slug": "zirconium",
    "group": 4,
    "period": 5,
    "x": 4,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 91.2242,
    "shells": [
      2,
      8,
      18,
      10,
      2
    ],
    "configuration": "[Kr] 4d2 5s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2",
    "electronegativity": 1.33,
    "ionization": 640.1,
    "melt": 2128,
    "boil": 4650,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/zirconium.webp",
      "title": "Two pieces of Zirconium, 1 cm each.",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/zirconium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/1/1d/Zirconium-pieces.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/40/zirconium"
  },
  {
    "number": 41,
    "symbol": "Nb",
    "english": "Niobium",
    "slug": "niobium",
    "group": 5,
    "period": 5,
    "x": 5,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 92.906372,
    "shells": [
      2,
      8,
      18,
      12,
      1
    ],
    "configuration": "[Kr] 4d4 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d4",
    "electronegativity": 1.6,
    "ionization": 652.1,
    "melt": 2750,
    "boil": 5017,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/niobium.webp",
      "title": "Niobium strips",
      "attribution": "Mauro Cateb, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c2/Niobium_strips.JPG"
    },
    "source": "https://periodic-table.rsc.org/element/41/niobium"
  },
  {
    "number": 42,
    "symbol": "Mo",
    "english": "Molybdenum",
    "slug": "molybdenum",
    "group": 6,
    "period": 5,
    "x": 6,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 95.951,
    "shells": [
      2,
      8,
      18,
      13,
      1
    ],
    "configuration": "[Kr] 4d5 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d5",
    "electronegativity": 2.16,
    "ionization": 684.3,
    "melt": 2896,
    "boil": 4912,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/molybdenum.webp",
      "title": "99.9 Pure Molybdenum Crystal, about 2 x 3 cm, with anodisation color",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/molybdenum.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f0/Molybdenum.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/42/molybdenum"
  },
  {
    "number": 43,
    "symbol": "Tc",
    "english": "Technetium",
    "slug": "technetium",
    "group": 7,
    "period": 5,
    "x": 7,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 98,
    "shells": [
      2,
      8,
      18,
      13,
      2
    ],
    "configuration": "[Kr] 4d5 5s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d5",
    "electronegativity": 1.9,
    "ionization": 702,
    "melt": 2430,
    "boil": 4538,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/technetium.webp",
      "title": "Technetium Sample inside a sealed glass ampoule, filled with argon gas. 6x1 mm goldfoil covered with 99Tc powder (electroplated).",
      "attribution": "GFDL, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/ab/Technetium-sample-cropped.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/43/technetium"
  },
  {
    "number": 44,
    "symbol": "Ru",
    "english": "Ruthenium",
    "slug": "ruthenium",
    "group": 8,
    "period": 5,
    "x": 8,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 101.072,
    "shells": [
      2,
      8,
      18,
      15,
      1
    ],
    "configuration": "[Kr] 4d7 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d7",
    "electronegativity": 2.2,
    "ionization": 710.2,
    "melt": 2607,
    "boil": 4423,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/ruthenium.webp",
      "title": "Ruthenium Crystal, 0.6 grams, 0.6 x 1.3 cm size",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/ruthenium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a8/Ruthenium_crystal.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/44/ruthenium"
  },
  {
    "number": 45,
    "symbol": "Rh",
    "english": "Rhodium",
    "slug": "rhodium",
    "group": 9,
    "period": 5,
    "x": 9,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 102.905502,
    "shells": [
      2,
      8,
      18,
      16,
      1
    ],
    "configuration": "[Kr] 4d8 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d8",
    "electronegativity": 2.28,
    "ionization": 719.7,
    "melt": 2237,
    "boil": 3968,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/rhodium.webp",
      "title": "Pure Rhodium Bead, 1 gram. Original size in cm: 0.5",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/rhodium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/54/Rhodium_%28Rh%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/45/rhodium"
  },
  {
    "number": 46,
    "symbol": "Pd",
    "english": "Palladium",
    "slug": "palladium",
    "group": 10,
    "period": 5,
    "x": 10,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 106.421,
    "shells": [
      2,
      8,
      18,
      18
    ],
    "configuration": "[Kr] 4d10",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10",
    "electronegativity": 2.2,
    "ionization": 804.4,
    "melt": 1828.05,
    "boil": 3236,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/palladium.webp",
      "title": "Palladium Crystal, about 1 gram. Original size in cm: 0.5 x 1",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/palladium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/d/d7/Palladium_%2846_Pd%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/46/palladium"
  },
  {
    "number": 47,
    "symbol": "Ag",
    "english": "Silver",
    "slug": "silver",
    "group": 11,
    "period": 5,
    "x": 11,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 107.86822,
    "shells": [
      2,
      8,
      18,
      18,
      1
    ],
    "configuration": "[Kr] 4d10 5s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10",
    "electronegativity": 1.93,
    "ionization": 731,
    "melt": 1234.93,
    "boil": 2435,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/silver.webp",
      "title": "Natural silver nugget, 1 cm long.",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: http://images-of-elements.com/silver.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/e4/Silver-nugget.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/47/silver"
  },
  {
    "number": 48,
    "symbol": "Cd",
    "english": "Cadmium",
    "slug": "cadmium",
    "group": 12,
    "period": 5,
    "x": 12,
    "y": 5,
    "block": "d",
    "category": "transition metal",
    "mass": 112.4144,
    "shells": [
      2,
      8,
      18,
      18,
      2
    ],
    "configuration": "[Kr] 4d10 5s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10",
    "electronegativity": 1.69,
    "ionization": 867.8,
    "melt": 594.22,
    "boil": 1040,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/cadmium.webp",
      "title": "48 Cd Cadmium",
      "attribution": "Chemical Elements A Virtual Museum / Jumk.de, CC BY 3.0 https://creativecommons.org/licenses/by/3.0/ ; source: https://images-of-elements.com/cadmium.php",
      "original": "https://images-of-elements.com/cadmium-4.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/48/cadmium"
  },
  {
    "number": 49,
    "symbol": "In",
    "english": "Indium",
    "slug": "indium",
    "group": 13,
    "period": 5,
    "x": 13,
    "y": 5,
    "block": "p",
    "category": "post-transition metal",
    "mass": 114.8181,
    "shells": [
      2,
      8,
      18,
      18,
      3
    ],
    "configuration": "[Kr] 4d10 5s2 5p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p1",
    "electronegativity": 1.78,
    "ionization": 558.3,
    "melt": 429.7485,
    "boil": 2345,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/indium.webp",
      "title": "1.5 x 1.5 cm liquid indium",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: http://images-of-elements.com/indium.php",
      "original": "https://images-of-elements.com/indium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/49/indium"
  },
  {
    "number": 50,
    "symbol": "Sn",
    "english": "Tin",
    "slug": "tin",
    "group": 14,
    "period": 5,
    "x": 14,
    "y": 5,
    "block": "p",
    "category": "post-transition metal",
    "mass": 118.7107,
    "shells": [
      2,
      8,
      18,
      18,
      4
    ],
    "configuration": "[Kr] 4d10 5s2 5p2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p2",
    "electronegativity": 1.96,
    "ionization": 708.6,
    "melt": 505.08,
    "boil": 2875,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/tin.webp",
      "title": "Tin blob",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: http://images-of-elements.com/tin.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/6a/Tin-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/50/tin"
  },
  {
    "number": 51,
    "symbol": "Sb",
    "english": "Antimony",
    "slug": "antimony",
    "group": 15,
    "period": 5,
    "x": 15,
    "y": 5,
    "block": "p",
    "category": "metalloid",
    "mass": 121.7601,
    "shells": [
      2,
      8,
      18,
      18,
      5
    ],
    "configuration": "[Kr] 4d10 5s2 5p3",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3",
    "electronegativity": 2.05,
    "ionization": 834,
    "melt": 903.78,
    "boil": 1908,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/antimony.webp",
      "title": "Antimony crystal, 2 grams, 1 cm",
      "attribution": "Unknown authorUnknown author, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/antimony.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/5c/Antimony-4.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/51/antimony"
  },
  {
    "number": 52,
    "symbol": "Te",
    "english": "Tellurium",
    "slug": "tellurium",
    "group": 16,
    "period": 5,
    "x": 16,
    "y": 5,
    "block": "p",
    "category": "metalloid",
    "mass": 127.603,
    "shells": [
      2,
      8,
      18,
      18,
      6
    ],
    "configuration": "[Kr] 4d10 5s2 5p4",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4",
    "electronegativity": 2.1,
    "ionization": 869.3,
    "melt": 722.66,
    "boil": 1261,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/tellurium.webp",
      "title": "Metallic tellurium, diameter 3.5 cm",
      "attribution": "Unknown authorUnknown author, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/tellurium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c1/Tellurium2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/52/tellurium"
  },
  {
    "number": 53,
    "symbol": "I",
    "english": "Iodine",
    "slug": "iodine",
    "group": 17,
    "period": 5,
    "x": 17,
    "y": 5,
    "block": "p",
    "category": "diatomic nonmetal",
    "mass": 126.904473,
    "shells": [
      2,
      8,
      18,
      18,
      7
    ],
    "configuration": "[Kr] 4d10 5s2 5p5",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5",
    "electronegativity": 2.66,
    "ionization": 1008.4,
    "melt": 386.85,
    "boil": 457.4,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/iodine.webp",
      "title": "Iodine Sample",
      "attribution": "Benjah-bmm27, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c2/Iodine-sample.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/53/iodine"
  },
  {
    "number": 54,
    "symbol": "Xe",
    "english": "Xenon",
    "slug": "xenon",
    "group": 18,
    "period": 5,
    "x": 18,
    "y": 5,
    "block": "p",
    "category": "noble gas",
    "mass": 131.2936,
    "shells": [
      2,
      8,
      18,
      18,
      8
    ],
    "configuration": "[Kr] 4d10 5s2 5p6",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6",
    "electronegativity": 2.6,
    "ionization": 1170.4,
    "melt": 161.4,
    "boil": 165.051,
    "phase": "Gas",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/xenon.webp",
      "title": "Vial of glowing ultrapure xenon. Original size in cm: 1 x 5",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/xenon.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/5d/Xenon-glow.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/54/xenon"
  },
  {
    "number": 55,
    "symbol": "Cs",
    "english": "Cesium",
    "slug": "cesium",
    "group": 1,
    "period": 6,
    "x": 1,
    "y": 6,
    "block": "s",
    "category": "alkali metal",
    "mass": 132.905451966,
    "shells": [
      2,
      8,
      18,
      18,
      8,
      1
    ],
    "configuration": "[Xe] 6s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1",
    "electronegativity": 0.79,
    "ionization": 375.7,
    "melt": 301.7,
    "boil": 944,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/cesium.webp",
      "title": "Cesium/Caesium metal",
      "attribution": "Dnn87 Contact email: Dnn87yahoo.dk, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/3/3d/Cesium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/55/caesium"
  },
  {
    "number": 56,
    "symbol": "Ba",
    "english": "Barium",
    "slug": "barium",
    "group": 2,
    "period": 6,
    "x": 2,
    "y": 6,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 137.3277,
    "shells": [
      2,
      8,
      18,
      18,
      8,
      2
    ],
    "configuration": "[Xe] 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2",
    "electronegativity": 0.89,
    "ionization": 502.9,
    "melt": 1000,
    "boil": 2118,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/barium.webp",
      "title": "1.5 Grams Barium with a Grey Oxide Layer under Argon. Original size in cm: 0.7 x 1",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/barium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f5/Barium_%2856_Ba%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/56/barium"
  },
  {
    "number": 57,
    "symbol": "La",
    "english": "Lanthanum",
    "slug": "lanthanum",
    "group": 3,
    "period": 6,
    "x": 3,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 138.905477,
    "shells": [
      2,
      8,
      18,
      18,
      9,
      2
    ],
    "configuration": "[Xe] 5d16s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 5d1",
    "electronegativity": 1.1,
    "ionization": 538.1,
    "melt": 1193,
    "boil": 3737,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/lanthanum.webp",
      "title": "1 cm Big Piece of Pure Lanthanum",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/lanthanum.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f7/Lanthanum.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/57/lanthanum"
  },
  {
    "number": 58,
    "symbol": "Ce",
    "english": "Cerium",
    "slug": "cerium",
    "group": 3,
    "period": 6,
    "x": 4,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 140.1161,
    "shells": [
      2,
      8,
      18,
      19,
      9,
      2
    ],
    "configuration": "[Xe] 4f1 5d1 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 5d1 4f1",
    "electronegativity": 1.12,
    "ionization": 534.4,
    "melt": 1068,
    "boil": 3716,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/cerium.webp",
      "title": "Ultrapure Cerium under Argon, 1.5 grams. Original size in cm: 1 x 1",
      "attribution": "Jurii, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/cerium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/0d/Cerium2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/58/cerium"
  },
  {
    "number": 59,
    "symbol": "Pr",
    "english": "Praseodymium",
    "slug": "praseodymium",
    "group": 3,
    "period": 6,
    "x": 5,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 140.907662,
    "shells": [
      2,
      8,
      18,
      21,
      8,
      2
    ],
    "configuration": "[Xe] 4f3 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3",
    "electronegativity": 1.13,
    "ionization": 527,
    "melt": 1208,
    "boil": 3403,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/praseodymium.webp",
      "title": "1.5 Grams Praseodymium under Argon, 0.5 cm big pieces",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/praseodymium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c7/Praseodymium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/59/praseodymium"
  },
  {
    "number": 60,
    "symbol": "Nd",
    "english": "Neodymium",
    "slug": "neodymium",
    "group": 3,
    "period": 6,
    "x": 6,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 144.2423,
    "shells": [
      2,
      8,
      18,
      22,
      8,
      2
    ],
    "configuration": "[Xe] 4f4 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f4",
    "electronegativity": 1.14,
    "ionization": 533.1,
    "melt": 1297,
    "boil": 3347,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/neodymium.webp",
      "title": "Ultrapure Neodymium under Argon, 5 grams. Original length of the large piece in cm: 1",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/neodymium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c9/Neodymium_%2860_Nd%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/60/neodymium"
  },
  {
    "number": 61,
    "symbol": "Pm",
    "english": "Promethium",
    "slug": "promethium",
    "group": 3,
    "period": 6,
    "x": 7,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 145,
    "shells": [
      2,
      8,
      18,
      23,
      8,
      2
    ],
    "configuration": "[Xe] 4f5 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f5",
    "electronegativity": 1.13,
    "ionization": 540,
    "melt": 1315,
    "boil": 3273,
    "phase": "Solid",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/61/promethium"
  },
  {
    "number": 62,
    "symbol": "Sm",
    "english": "Samarium",
    "slug": "samarium",
    "group": 3,
    "period": 6,
    "x": 8,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 150.362,
    "shells": [
      2,
      8,
      18,
      24,
      8,
      2
    ],
    "configuration": "[Xe] 4f6 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f6",
    "electronegativity": 1.17,
    "ionization": 544.5,
    "melt": 1345,
    "boil": 2173,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/samarium.webp",
      "title": "Ultrapure Sublimated Samarium, 2 grams. Original size in cm: 0.8 x 1.5",
      "attribution": "Unknown authorUnknown author, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/samarium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/8/88/Samarium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/62/samarium"
  },
  {
    "number": 63,
    "symbol": "Eu",
    "english": "Europium",
    "slug": "europium",
    "group": 3,
    "period": 6,
    "x": 9,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 151.9641,
    "shells": [
      2,
      8,
      18,
      25,
      8,
      2
    ],
    "configuration": "[Xe] 4f7 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7",
    "electronegativity": 1.2,
    "ionization": 547.1,
    "melt": 1099,
    "boil": 1802,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/europium.webp",
      "title": "Weakly Oxidized Europium, hence slightly yellowish. 1.5 grams, large piece 0.6 x 1.6 cm.",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/europium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/6a/Europium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/63/europium"
  },
  {
    "number": 64,
    "symbol": "Gd",
    "english": "Gadolinium",
    "slug": "gadolinium",
    "group": 3,
    "period": 6,
    "x": 10,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 157.253,
    "shells": [
      2,
      8,
      18,
      25,
      9,
      2
    ],
    "configuration": "[Xe] 4f7 5d1 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 5d1",
    "electronegativity": 1.2,
    "ionization": 593.4,
    "melt": 1585,
    "boil": 3273,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/gadolinium.webp",
      "title": "Pure (99.95%) Amorphous Gadolinium, about 12 grams, 2 × 1.5 × 0.5 cm, cast in acrylic glass",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/gadolinium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c2/Gadolinium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/64/gadolinium"
  },
  {
    "number": 65,
    "symbol": "Tb",
    "english": "Terbium",
    "slug": "terbium",
    "group": 3,
    "period": 6,
    "x": 11,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 158.925352,
    "shells": [
      2,
      8,
      18,
      27,
      8,
      2
    ],
    "configuration": "[Xe] 4f9 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f9",
    "electronegativity": 1.1,
    "ionization": 565.8,
    "melt": 1629,
    "boil": 3396,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/terbium.webp",
      "title": "Pure Terbium, 3 grams. Original size: 1 cm",
      "attribution": "Unknown authorUnknown author, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/terbium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/9/9a/Terbium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/65/terbium"
  },
  {
    "number": 66,
    "symbol": "Dy",
    "english": "Dysprosium",
    "slug": "dysprosium",
    "group": 3,
    "period": 6,
    "x": 12,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 162.5001,
    "shells": [
      2,
      8,
      18,
      28,
      8,
      2
    ],
    "configuration": "[Xe] 4f10 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f10",
    "electronegativity": 1.22,
    "ionization": 573,
    "melt": 1680,
    "boil": 2840,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/dysprosium.webp",
      "title": "Pure Dysprosium Dendrites",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/dysprosium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/55/Dysprosium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/66/dysprosium"
  },
  {
    "number": 67,
    "symbol": "Ho",
    "english": "Holmium",
    "slug": "holmium",
    "group": 3,
    "period": 6,
    "x": 13,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 164.930332,
    "shells": [
      2,
      8,
      18,
      29,
      8,
      2
    ],
    "configuration": "[Xe] 4f11 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f11",
    "electronegativity": 1.23,
    "ionization": 581,
    "melt": 1734,
    "boil": 2873,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/holmium.webp",
      "title": "Ultrapure Holmium, 17 grams. Original size in cm: 1.5 x 2.5",
      "attribution": "Unknown authorUnknown author, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/holmium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/0a/Holmium2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/67/holmium"
  },
  {
    "number": 68,
    "symbol": "Er",
    "english": "Erbium",
    "slug": "erbium",
    "group": 3,
    "period": 6,
    "x": 14,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 167.2593,
    "shells": [
      2,
      8,
      18,
      30,
      8,
      2
    ],
    "configuration": "[Xe] 4f12 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f12",
    "electronegativity": 1.24,
    "ionization": 589.3,
    "melt": 1802,
    "boil": 3141,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/erbium.webp",
      "title": "9.5 Gramms Pure Erbium, 2 x 2 cm",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/erbium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/2a/Erbium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/68/erbium"
  },
  {
    "number": 69,
    "symbol": "Tm",
    "english": "Thulium",
    "slug": "thulium",
    "group": 3,
    "period": 6,
    "x": 15,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 168.934222,
    "shells": [
      2,
      8,
      18,
      31,
      8,
      2
    ],
    "configuration": "[Xe] 4f13 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f13",
    "electronegativity": 1.25,
    "ionization": 596.7,
    "melt": 1818,
    "boil": 2223,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/thulium.webp",
      "title": "Ultrapure (99.997%) Crystalline Thulium, 22.3 grams, 3 × 3 × 2 cm in size",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/thulium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/6b/Thulium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/69/thulium"
  },
  {
    "number": 70,
    "symbol": "Yb",
    "english": "Ytterbium",
    "slug": "ytterbium",
    "group": 3,
    "period": 6,
    "x": 16,
    "y": 9,
    "block": "f",
    "category": "lanthanide",
    "mass": 173.0451,
    "shells": [
      2,
      8,
      18,
      32,
      8,
      2
    ],
    "configuration": "[Xe] 4f14 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14",
    "electronegativity": 1.1,
    "ionization": 603.4,
    "melt": 1097,
    "boil": 1469,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/ytterbium.webp",
      "title": "Ytterbium, 0.5 x 1 cm",
      "attribution": "Jurii, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/ytterbium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/ce/Ytterbium-3.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/70/ytterbium"
  },
  {
    "number": 71,
    "symbol": "Lu",
    "english": "Lutetium",
    "slug": "lutetium",
    "group": 3,
    "period": 6,
    "x": 17,
    "y": 9,
    "block": "d",
    "category": "lanthanide",
    "mass": 174.96681,
    "shells": [
      2,
      8,
      18,
      32,
      9,
      2
    ],
    "configuration": "[Xe] 4f14 5d1 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d1",
    "electronegativity": 1.27,
    "ionization": 523.5,
    "melt": 1925,
    "boil": 3675,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/lutetium.webp",
      "title": "1 cm Big Piece of Pure Lutetium",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/lutetium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/e8/Lutetium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/71/lutetium"
  },
  {
    "number": 72,
    "symbol": "Hf",
    "english": "Hafnium",
    "slug": "hafnium",
    "group": 4,
    "period": 6,
    "x": 4,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 178.492,
    "shells": [
      2,
      8,
      18,
      32,
      10,
      2
    ],
    "configuration": "[Xe] 4f14 5d2 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d2",
    "electronegativity": 1.3,
    "ionization": 658.5,
    "melt": 2506,
    "boil": 4876,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/hafnium.webp",
      "title": "Electrolytic Hafnium, 22 grams. Original size in cm: 1 x 2 x 3",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/hafnium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/1/17/Hafnium_%2872_Hf%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/72/hafnium"
  },
  {
    "number": 73,
    "symbol": "Ta",
    "english": "Tantalum",
    "slug": "tantalum",
    "group": 5,
    "period": 6,
    "x": 5,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 180.947882,
    "shells": [
      2,
      8,
      18,
      32,
      11,
      2
    ],
    "configuration": "[Xe] 4f14 5d3 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d3",
    "electronegativity": 1.5,
    "ionization": 761,
    "melt": 3290,
    "boil": 5731,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/tantalum.webp",
      "title": "Piece of tantalum, 1 cm in size",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/tantalum.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/61/Tantalum.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/73/tantalum"
  },
  {
    "number": 74,
    "symbol": "W",
    "english": "Tungsten",
    "slug": "tungsten",
    "group": 6,
    "period": 6,
    "x": 6,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 183.841,
    "shells": [
      2,
      8,
      18,
      32,
      12,
      2
    ],
    "configuration": "[Xe] 4f14 5d4 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d4",
    "electronegativity": 2.36,
    "ionization": 770,
    "melt": 3695,
    "boil": 6203,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/tungsten.webp",
      "title": "Tungsten rod with oxidised surface, 80 grams. Original size in cm: 1.3 x 3",
      "attribution": "Jurii, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/tungsten.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/c/c8/Tungsten_rod_with_oxidised_surface.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/74/tungsten"
  },
  {
    "number": 75,
    "symbol": "Re",
    "english": "Rhenium",
    "slug": "rhenium",
    "group": 7,
    "period": 6,
    "x": 7,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 186.2071,
    "shells": [
      2,
      8,
      18,
      32,
      13,
      2
    ],
    "configuration": "[Xe] 4f14 5d5 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5",
    "electronegativity": 1.9,
    "ionization": 760,
    "melt": 3459,
    "boil": 5869,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/rhenium.webp",
      "title": "Pure Rhenium Bead, arc melted, 21 grams. Original size in cm: 1.5 x 1.7. Measured radiation dose <0.05 μS/h.",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/rhenium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/d/d9/Pure_rhenium_bead%2C_arc_melted%2C_21_grams._Original_size_in_cm_-_1.5_x_1.7.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/75/rhenium"
  },
  {
    "number": 76,
    "symbol": "Os",
    "english": "Osmium",
    "slug": "osmium",
    "group": 8,
    "period": 6,
    "x": 8,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 190.233,
    "shells": [
      2,
      8,
      18,
      32,
      14,
      2
    ],
    "configuration": "[Xe] 4f14 5d6 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d6",
    "electronegativity": 2.2,
    "ionization": 840,
    "melt": 3306,
    "boil": 5285,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/osmium.webp",
      "title": "Pure Osmium Bead",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/osmium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/3/3c/Osmium-bead.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/76/osmium"
  },
  {
    "number": 77,
    "symbol": "Ir",
    "english": "Iridium",
    "slug": "iridium",
    "group": 9,
    "period": 6,
    "x": 9,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 192.2173,
    "shells": [
      2,
      8,
      18,
      32,
      15,
      2
    ],
    "configuration": "[Xe] 4f14 5d7 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d7",
    "electronegativity": 2.2,
    "ionization": 880,
    "melt": 2719,
    "boil": 4403,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/iridium.webp",
      "title": "Pieces of Pure Iridium, 1 gram. Original size: 0.1 - 0.3 cm each",
      "attribution": "Unknown authorUnknown author, CC BY 1.0 <https://creativecommons.org/licenses/by/1.0>, via Wikimedia Commons, source: https://images-of-elements.com/iridium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a8/Iridium-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/77/iridium"
  },
  {
    "number": 78,
    "symbol": "Pt",
    "english": "Platinum",
    "slug": "platinum",
    "group": 10,
    "period": 6,
    "x": 10,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 195.0849,
    "shells": [
      2,
      8,
      18,
      32,
      17,
      1
    ],
    "configuration": "[Xe] 4f14 5d9 6s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 4f14 5d9",
    "electronegativity": 2.28,
    "ionization": 870,
    "melt": 2041.4,
    "boil": 4098,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/platinum.webp",
      "title": "Crystals of Pure Platinum grown by gas phase transport",
      "attribution": "Periodictableru, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/68/Platinum_crystals.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/78/platinum"
  },
  {
    "number": 79,
    "symbol": "Au",
    "english": "Gold",
    "slug": "gold",
    "group": 11,
    "period": 6,
    "x": 11,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 196.9665695,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      1
    ],
    "configuration": "[Xe] 4f14 5d10 6s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 4f14 5d10",
    "electronegativity": 2.54,
    "ionization": 890.1,
    "melt": 1337.33,
    "boil": 3243,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/gold.webp",
      "title": "Ultrapure Gold Leaf",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/gold.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/8/8a/Gold_%2879_Au%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/79/gold"
  },
  {
    "number": 80,
    "symbol": "Hg",
    "english": "Mercury",
    "slug": "mercury",
    "group": 12,
    "period": 6,
    "x": 12,
    "y": 6,
    "block": "d",
    "category": "transition metal",
    "mass": 200.5923,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      2
    ],
    "configuration": "[Xe] 4f14 5d10 6s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10",
    "electronegativity": 2,
    "ionization": 1007.1,
    "melt": 234.321,
    "boil": 629.88,
    "phase": "Liquid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/mercury.webp",
      "title": "6 grams pure mercury. Diameter of the inner disc: 2 cm",
      "attribution": "Hi-Res Images of Chemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/mercury.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/be/Hydrargyrum_%2880_Hg%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/80/mercury"
  },
  {
    "number": 81,
    "symbol": "Tl",
    "english": "Thallium",
    "slug": "thallium",
    "group": 13,
    "period": 6,
    "x": 13,
    "y": 6,
    "block": "p",
    "category": "post-transition metal",
    "mass": 204.38,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      3
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p1",
    "electronegativity": 1.62,
    "ionization": 589.4,
    "melt": 577,
    "boil": 1746,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/thallium.webp",
      "title": "8 grams pure thallium under argon. Original size in cm: 0.7 x 1.5",
      "attribution": "Hi-Res Images ofChemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/thallium.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/55/Thallium_%2881_Tl%29.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/81/thallium"
  },
  {
    "number": 82,
    "symbol": "Pb",
    "english": "Lead",
    "slug": "lead",
    "group": 14,
    "period": 6,
    "x": 14,
    "y": 6,
    "block": "p",
    "category": "post-transition metal",
    "mass": 207.21,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      4
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p2",
    "electronegativity": 1.87,
    "ionization": 715.6,
    "melt": 600.61,
    "boil": 2022,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/lead.webp",
      "title": "Ultrapure Lead Bead from two sides. Original size in cm: 1.5 x 2",
      "attribution": "Chemical Elements, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/lead.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/63/Lead-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/82/lead"
  },
  {
    "number": 83,
    "symbol": "Bi",
    "english": "Bismuth",
    "slug": "bismuth",
    "group": 15,
    "period": 6,
    "x": 15,
    "y": 6,
    "block": "p",
    "category": "post-transition metal",
    "mass": 208.980401,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      5
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p3",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p3",
    "electronegativity": 2.02,
    "ionization": 703,
    "melt": 544.7,
    "boil": 1837,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/bismuth.webp",
      "title": "Bismuth Crystal",
      "attribution": "Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/bismuth.php",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/a5/Bismuth-2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/83/bismuth"
  },
  {
    "number": 84,
    "symbol": "Po",
    "english": "Polonium",
    "slug": "polonium",
    "group": 16,
    "period": 6,
    "x": 16,
    "y": 6,
    "block": "p",
    "category": "post-transition metal",
    "mass": 209,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      6
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p4",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p4",
    "electronegativity": 2,
    "ionization": 812.1,
    "melt": 527,
    "boil": 1235,
    "phase": "Solid",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/84/polonium"
  },
  {
    "number": 85,
    "symbol": "At",
    "english": "Astatine",
    "slug": "astatine",
    "group": 17,
    "period": 6,
    "x": 17,
    "y": 6,
    "block": "p",
    "category": "metalloid",
    "mass": 210,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      7
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p5",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p5",
    "electronegativity": 2.2,
    "ionization": 899.003,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/85/astatine"
  },
  {
    "number": 86,
    "symbol": "Rn",
    "english": "Radon",
    "slug": "radon",
    "group": 18,
    "period": 6,
    "x": 18,
    "y": 6,
    "block": "p",
    "category": "noble gas",
    "mass": 222,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      8
    ],
    "configuration": "[Xe] 4f14 5d10 6s2 6p6",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6",
    "electronegativity": 2.2,
    "ionization": 1037,
    "melt": 202,
    "boil": 211.5,
    "phase": "Gas",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/86/radon"
  },
  {
    "number": 87,
    "symbol": "Fr",
    "english": "Francium",
    "slug": "francium",
    "group": 1,
    "period": 7,
    "x": 1,
    "y": 7,
    "block": "s",
    "category": "alkali metal",
    "mass": 223,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      8,
      1
    ],
    "configuration": "[Rn] 7s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s1",
    "electronegativity": 0.79,
    "ionization": 380,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/87/francium"
  },
  {
    "number": 88,
    "symbol": "Ra",
    "english": "Radium",
    "slug": "radium",
    "group": 2,
    "period": 7,
    "x": 2,
    "y": 7,
    "block": "s",
    "category": "alkaline earth metal",
    "mass": 226,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      8,
      2
    ],
    "configuration": "[Rn] 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2",
    "electronegativity": 0.9,
    "ionization": 509.3,
    "melt": 1233,
    "boil": 2010,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/radium.webp",
      "title": "Radium electroplated on a very small sample of copper foil and covered with polyurethane to prevent reaction with the air",
      "attribution": "grenadier, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/bb/Radium226.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/88/radium"
  },
  {
    "number": 89,
    "symbol": "Ac",
    "english": "Actinium",
    "slug": "actinium",
    "group": 3,
    "period": 7,
    "x": 3,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 227,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      9,
      2
    ],
    "configuration": "[Rn] 6d1 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 6d1",
    "electronegativity": 1.1,
    "ionization": 499,
    "melt": 1500,
    "boil": 3500,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/actinium.webp",
      "title": "Actinium-225 medical radioisotope held in a v-vial at ORNL. The blue glow comes from the ionization of surrounding air by alpha particles",
      "attribution": "Oak Ridge National Laboratory, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons, source: https://www.flickr.com/photos/oakridgelab/31481701837/",
      "original": "https://upload.wikimedia.org/wikipedia/commons/2/27/Actinium_sample_%2831481701837%29.png"
    },
    "source": "https://periodic-table.rsc.org/element/89/actinium"
  },
  {
    "number": 90,
    "symbol": "Th",
    "english": "Thorium",
    "slug": "thorium",
    "group": 3,
    "period": 7,
    "x": 4,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 232.03774,
    "shells": [
      2,
      8,
      18,
      32,
      18,
      10,
      2
    ],
    "configuration": "[Rn] 6d2 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 6d2",
    "electronegativity": 1.3,
    "ionization": 587,
    "melt": 2023,
    "boil": 5061,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/thorium.webp",
      "title": "Thorium Metal in Ampoule, corroded",
      "attribution": "W. Oelen, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/f7/Thorium-1.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/90/thorium"
  },
  {
    "number": 91,
    "symbol": "Pa",
    "english": "Protactinium",
    "slug": "protactinium",
    "group": 3,
    "period": 7,
    "x": 5,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 231.035882,
    "shells": [
      2,
      8,
      18,
      32,
      20,
      9,
      2
    ],
    "configuration": "[Rn] 5f2 6d1 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f2 6d1",
    "electronegativity": 1.5,
    "ionization": 568,
    "melt": 1841,
    "boil": 4300,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/protactinium.webp",
      "title": "This sample of Protactinium-233 (dark circular area in the photo) was photographed in the light from its own radioactive emission (the lighter area) at the National Reactor Testing Station in Idaho.",
      "attribution": "ENERGY.GOV, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/a/af/Protactinium-233.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/91/protactinium"
  },
  {
    "number": 92,
    "symbol": "U",
    "english": "Uranium",
    "slug": "uranium",
    "group": 3,
    "period": 7,
    "x": 6,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 238.028913,
    "shells": [
      2,
      8,
      18,
      32,
      21,
      9,
      2
    ],
    "configuration": "[Rn] 5f3 6d1 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f3 6d1",
    "electronegativity": 1.38,
    "ionization": 597.6,
    "melt": 1405.3,
    "boil": 4404,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/uranium.webp",
      "title": "A biscuit of uranium metal after reduction via the Ames Process. c.1943.",
      "attribution": "Unknown authorUnknown author, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/b/b2/Ames_Process_uranium_biscuit.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/92/uranium"
  },
  {
    "number": 93,
    "symbol": "Np",
    "english": "Neptunium",
    "slug": "neptunium",
    "group": 3,
    "period": 7,
    "x": 7,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 237,
    "shells": [
      2,
      8,
      18,
      32,
      22,
      9,
      2
    ],
    "configuration": "[Rn] 5f4 6d1 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1",
    "electronegativity": 1.36,
    "ionization": 604.5,
    "melt": 912,
    "boil": 4447,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/neptunium.webp",
      "title": "Neptunium 237 sphere (6 kg)",
      "attribution": "Los Alamos National Laboratory,, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/e5/Neptunium2.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/93/neptunium"
  },
  {
    "number": 94,
    "symbol": "Pu",
    "english": "Plutonium",
    "slug": "plutonium",
    "group": 3,
    "period": 7,
    "x": 8,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 244,
    "shells": [
      2,
      8,
      18,
      32,
      24,
      8,
      2
    ],
    "configuration": "[Rn] 5f6 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f6",
    "electronegativity": 1.28,
    "ionization": 584.7,
    "melt": 912.5,
    "boil": 3505,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/plutonium.webp",
      "title": "Plutonium metal sample",
      "attribution": "Los Alamos National Laboratory / LANS. Attribution permission: https://commons.wikimedia.org/wiki/File:Plutonium_ring.jpg . Unless otherwise indicated, this information has been authored by an employee or employees of the Los Alamos National Security, LLC (LANS), operator of the Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this information. The public may copy and use this information without charge, provided that this Notice and any statement of authorship are reproduced on all copies. Neither the Government nor LANS makes any warranty, express or implied, or assumes any liability or responsibility for the use of this information.",
      "original": "https://upload.wikimedia.org/wikipedia/commons/0/0f/Plutonium_ring.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/94/plutonium"
  },
  {
    "number": 95,
    "symbol": "Am",
    "english": "Americium",
    "slug": "americium",
    "group": 3,
    "period": 7,
    "x": 9,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 243,
    "shells": [
      2,
      8,
      18,
      32,
      25,
      8,
      2
    ],
    "configuration": "[Rn] 5f7 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f7",
    "electronegativity": 1.13,
    "ionization": 578,
    "melt": 1449,
    "boil": 2880,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/americium.webp",
      "title": "A small disc of Am-241 under the microscope.",
      "attribution": "Bionerd, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/e/ee/Americium_microscope.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/95/americium"
  },
  {
    "number": 96,
    "symbol": "Cm",
    "english": "Curium",
    "slug": "curium",
    "group": 3,
    "period": 7,
    "x": 10,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 247,
    "shells": [
      2,
      8,
      18,
      32,
      25,
      9,
      2
    ],
    "configuration": "[Rn] 5f7 6d1 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f7 6d1",
    "electronegativity": 1.28,
    "ionization": 581,
    "melt": 1613,
    "boil": 3383,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/curium.webp",
      "title": "Museum display labelled Curium, photographed by James St. John; isotope and purity not inferred from the photograph",
      "attribution": "James St. John, CC BY 2.0 https://creativecommons.org/licenses/by/2.0/ ; source: https://commons.wikimedia.org/wiki/File:Curium_(Element_-_96)_1.jpg",
      "original": "https://upload.wikimedia.org/wikipedia/commons/6/6d/Curium_%28Element_-_96%29_1.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/96/curium"
  },
  {
    "number": 97,
    "symbol": "Bk",
    "english": "Berkelium",
    "slug": "berkelium",
    "group": 3,
    "period": 7,
    "x": 11,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 247,
    "shells": [
      2,
      8,
      18,
      32,
      27,
      8,
      2
    ],
    "configuration": "[Rn] 5f9 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f9",
    "electronegativity": 1.3,
    "ionization": 601,
    "melt": 1259,
    "boil": 2900,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/berkelium.webp",
      "title": "It took 250 days to make enough berkelium, shown here (in dissolved state), to synthesize element 117",
      "attribution": "ORNL, Department of Energy, Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/f/fc/Berkelium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/97/berkelium"
  },
  {
    "number": 98,
    "symbol": "Cf",
    "english": "Californium",
    "slug": "californium",
    "group": 3,
    "period": 7,
    "x": 12,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 251,
    "shells": [
      2,
      8,
      18,
      32,
      28,
      8,
      2
    ],
    "configuration": "[Rn] 5f10 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f10",
    "electronegativity": 1.3,
    "ionization": 608,
    "melt": 1173,
    "boil": 1743,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/californium.webp",
      "title": "A disc of californium metal (249Cf, 10 mg). The source implies that the disc has a diameter about twice the thickness of a typical pin, or on the order of 1 mm",
      "attribution": "United States Department of Energy (see File:Einsteinium.jpg), Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/9/93/Californium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/98/californium"
  },
  {
    "number": 99,
    "symbol": "Es",
    "english": "Einsteinium",
    "slug": "einsteinium",
    "group": 3,
    "period": 7,
    "x": 13,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 252,
    "shells": [
      2,
      8,
      18,
      32,
      29,
      8,
      2
    ],
    "configuration": "[Rn] 5f11 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f11",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Solid",
    "photo": {
      "src": "/lesson-assets/periodic-table/photos/einsteinium.webp",
      "title": "300 micrograms of Einsteinium 253, which has a half-life of 20 days.",
      "attribution": "Haire, R. G., US Department of Energy.Touched up by Materialscientist at en.wikipedia., Public domain, via Wikimedia Commons",
      "original": "https://upload.wikimedia.org/wikipedia/commons/5/55/Einsteinium.jpg"
    },
    "source": "https://periodic-table.rsc.org/element/99/einsteinium"
  },
  {
    "number": 100,
    "symbol": "Fm",
    "english": "Fermium",
    "slug": "fermium",
    "group": 3,
    "period": 7,
    "x": 14,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 257,
    "shells": [
      2,
      8,
      18,
      32,
      30,
      8,
      2
    ],
    "configuration": "[Rn] 5f12 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f12",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/100/fermium"
  },
  {
    "number": 101,
    "symbol": "Md",
    "english": "Mendelevium",
    "slug": "mendelevium",
    "group": 3,
    "period": 7,
    "x": 15,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 258,
    "shells": [
      2,
      8,
      18,
      32,
      31,
      8,
      2
    ],
    "configuration": "[Rn] 5f13 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f13",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/101/mendelevium"
  },
  {
    "number": 102,
    "symbol": "No",
    "english": "Nobelium",
    "slug": "nobelium",
    "group": 3,
    "period": 7,
    "x": 16,
    "y": 10,
    "block": "f",
    "category": "actinide",
    "mass": 259,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      8,
      2
    ],
    "configuration": "[Rn] 5f14 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/102/nobelium"
  },
  {
    "number": 103,
    "symbol": "Lr",
    "english": "Lawrencium",
    "slug": "lawrencium",
    "group": 3,
    "period": 7,
    "x": 17,
    "y": 10,
    "block": "d",
    "category": "actinide",
    "mass": 266,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      8,
      3
    ],
    "configuration": "[Rn] 5f14 7s2 7p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 7p1",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/103/lawrencium"
  },
  {
    "number": 104,
    "symbol": "Rf",
    "english": "Rutherfordium",
    "slug": "rutherfordium",
    "group": 4,
    "period": 7,
    "x": 4,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 267,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      10,
      2
    ],
    "configuration": "[Rn] 5f14 6d2 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d2",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/104/rutherfordium"
  },
  {
    "number": 105,
    "symbol": "Db",
    "english": "Dubnium",
    "slug": "dubnium",
    "group": 5,
    "period": 7,
    "x": 5,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 268,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      11,
      2
    ],
    "configuration": "*[Rn] 5f14 6d3 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d3",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/105/dubnium"
  },
  {
    "number": 106,
    "symbol": "Sg",
    "english": "Seaborgium",
    "slug": "seaborgium",
    "group": 6,
    "period": 7,
    "x": 6,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 269,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      12,
      2
    ],
    "configuration": "*[Rn] 5f14 6d4 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d4",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/106/seaborgium"
  },
  {
    "number": 107,
    "symbol": "Bh",
    "english": "Bohrium",
    "slug": "bohrium",
    "group": 7,
    "period": 7,
    "x": 7,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 270,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      13,
      2
    ],
    "configuration": "*[Rn] 5f14 6d5 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d5",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/107/bohrium"
  },
  {
    "number": 108,
    "symbol": "Hs",
    "english": "Hassium",
    "slug": "hassium",
    "group": 8,
    "period": 7,
    "x": 8,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 269,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      14,
      2
    ],
    "configuration": "*[Rn] 5f14 6d6 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d6",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/108/hassium"
  },
  {
    "number": 109,
    "symbol": "Mt",
    "english": "Meitnerium",
    "slug": "meitnerium",
    "group": 9,
    "period": 7,
    "x": 9,
    "y": 7,
    "block": "d",
    "category": "unknown, probably transition metal",
    "mass": 278,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      15,
      2
    ],
    "configuration": "*[Rn] 5f14 6d7 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d7",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/109/meitnerium"
  },
  {
    "number": 110,
    "symbol": "Ds",
    "english": "Darmstadtium",
    "slug": "darmstadtium",
    "group": 10,
    "period": 7,
    "x": 10,
    "y": 7,
    "block": "d",
    "category": "unknown, probably transition metal",
    "mass": 281,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      16,
      2
    ],
    "configuration": "*[Rn] 5f14 6d9 7s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/110/darmstadtium"
  },
  {
    "number": 111,
    "symbol": "Rg",
    "english": "Roentgenium",
    "slug": "roentgenium",
    "group": 11,
    "period": 7,
    "x": 11,
    "y": 7,
    "block": "d",
    "category": "unknown, probably transition metal",
    "mass": 282,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      17,
      2
    ],
    "configuration": "*[Rn] 5f14 6d10 7s1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/111/roentgenium"
  },
  {
    "number": 112,
    "symbol": "Cn",
    "english": "Copernicium",
    "slug": "copernicium",
    "group": 12,
    "period": 7,
    "x": 12,
    "y": 7,
    "block": "d",
    "category": "transition metal",
    "mass": 285,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      2
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/112/copernicium"
  },
  {
    "number": 113,
    "symbol": "Nh",
    "english": "Nihonium",
    "slug": "nihonium",
    "group": 13,
    "period": 7,
    "x": 13,
    "y": 7,
    "block": "p",
    "category": "unknown, probably transition metal",
    "mass": 286,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      3
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p1",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p1",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/113/nihonium"
  },
  {
    "number": 114,
    "symbol": "Fl",
    "english": "Flerovium",
    "slug": "flerovium",
    "group": 14,
    "period": 7,
    "x": 14,
    "y": 7,
    "block": "p",
    "category": "post-transition metal",
    "mass": 289,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      4
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p2",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p2",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/114/flerovium"
  },
  {
    "number": 115,
    "symbol": "Mc",
    "english": "Moscovium",
    "slug": "moscovium",
    "group": 15,
    "period": 7,
    "x": 15,
    "y": 7,
    "block": "p",
    "category": "unknown, probably post-transition metal",
    "mass": 289,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      5
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p3",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p3",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/115/moscovium"
  },
  {
    "number": 116,
    "symbol": "Lv",
    "english": "Livermorium",
    "slug": "livermorium",
    "group": 16,
    "period": 7,
    "x": 16,
    "y": 7,
    "block": "p",
    "category": "unknown, probably post-transition metal",
    "mass": 293,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      6
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p4",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p4",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/116/livermorium"
  },
  {
    "number": 117,
    "symbol": "Ts",
    "english": "Tennessine",
    "slug": "tennessine",
    "group": 17,
    "period": 7,
    "x": 17,
    "y": 7,
    "block": "p",
    "category": "unknown, probably metalloid",
    "mass": 294,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      7
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p5",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p5",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/117/tennessine"
  },
  {
    "number": 118,
    "symbol": "Og",
    "english": "Oganesson",
    "slug": "oganesson",
    "group": 18,
    "period": 7,
    "x": 18,
    "y": 7,
    "block": "p",
    "category": "unknown, predicted to be noble gas",
    "mass": 294,
    "shells": [
      2,
      8,
      18,
      32,
      32,
      18,
      8
    ],
    "configuration": "*[Rn] 5f14 6d10 7s2 7p6",
    "fullConfiguration": "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6",
    "electronegativity": null,
    "ionization": null,
    "melt": null,
    "boil": null,
    "phase": "Unknown",
    "photo": null,
    "source": "https://periodic-table.rsc.org/element/118/oganesson"
  }
]