{
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  "source": "https://periodicbubbles.com/api/",
  "generated": "2026-09-04",
  "licence": {
   "data": "Numerical data: Periodic-Table-JSON, CC BY-SA 4.0 (attribution required). Two corrections by Periodic Bubbles: copernicium boil 357 K (predicted), hassium melt removed.",
   "text": "Written content (tagline, intro, sections, facts, faq) is copyright Periodic Bubbles. You may quote it with attribution and a link to the element page."
  },
  "units": {
   "atomic_mass": "u",
   "melt": "K",
   "boil": "K",
   "density": "g/cm3 (g/L for gases)",
   "molar_heat": "J/(mol K)",
   "electron_affinity": "kJ/mol",
   "ionization_energies": "kJ/mol"
  }
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 "count": 118,
 "elements": [
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   "number": 1,
   "symbol": "H",
   "name": "Hydrogen",
   "slug": "hydrogen",
   "atomic_mass": 1.008,
   "category": "diatomic nonmetal",
   "phase": "Gas",
   "group": 1,
   "period": 1,
   "block": "s",
   "density": 0.08988,
   "melt": 13.99,
   "boil": 20.271,
   "electronegativity_pauling": 2.2,
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  {
   "number": 2,
   "symbol": "He",
   "name": "Helium",
   "slug": "helium",
   "atomic_mass": 4.0026022,
   "category": "noble gas",
   "phase": "Gas",
   "group": 18,
   "period": 1,
   "block": "s",
   "density": 0.1786,
   "melt": 0.95,
   "boil": 4.222,
   "electronegativity_pauling": null,
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  {
   "number": 3,
   "symbol": "Li",
   "name": "Lithium",
   "slug": "lithium",
   "atomic_mass": 6.94,
   "category": "alkali metal",
   "phase": "Solid",
   "group": 1,
   "period": 2,
   "block": "s",
   "density": 0.534,
   "melt": 453.65,
   "boil": 1603,
   "electronegativity_pauling": 0.98,
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  {
   "number": 4,
   "symbol": "Be",
   "name": "Beryllium",
   "slug": "beryllium",
   "atomic_mass": 9.01218315,
   "category": "alkaline earth metal",
   "phase": "Solid",
   "group": 2,
   "period": 2,
   "block": "s",
   "density": 1.85,
   "melt": 1560,
   "boil": 2742,
   "electronegativity_pauling": 1.57,
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  {
   "number": 5,
   "symbol": "B",
   "name": "Boron",
   "slug": "boron",
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   "period": 2,
   "block": "p",
   "density": 2.08,
   "melt": 2349,
   "boil": 4200,
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   "symbol": "C",
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  {
   "number": 7,
   "symbol": "N",
   "name": "Nitrogen",
   "slug": "nitrogen",
   "atomic_mass": 14.007,
   "category": "diatomic nonmetal",
   "phase": "Gas",
   "group": 15,
   "period": 2,
   "block": "p",
   "density": 1.251,
   "melt": 63.15,
   "boil": 77.355,
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  {
   "number": 8,
   "symbol": "O",
   "name": "Oxygen",
   "slug": "oxygen",
   "atomic_mass": 15.999,
   "category": "diatomic nonmetal",
   "phase": "Gas",
   "group": 16,
   "period": 2,
   "block": "p",
   "density": 1.429,
   "melt": 54.36,
   "boil": 90.188,
   "electronegativity_pauling": 3.44,
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   "number": 9,
   "symbol": "F",
   "name": "Fluorine",
   "slug": "fluorine",
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   "category": "diatomic nonmetal",
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   "boil": 85.03,
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  {
   "number": 10,
   "symbol": "Ne",
   "name": "Neon",
   "slug": "neon",
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   "category": "noble gas",
   "phase": "Gas",
   "group": 18,
   "period": 2,
   "block": "p",
   "density": 0.9002,
   "melt": 24.56,
   "boil": 27.104,
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  {
   "number": 11,
   "symbol": "Na",
   "name": "Sodium",
   "slug": "sodium",
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   "category": "alkali metal",
   "phase": "Solid",
   "group": 1,
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   "block": "s",
   "density": 0.968,
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   "number": 12,
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   "density": 1.738,
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   "number": 13,
   "symbol": "Al",
   "name": "Aluminium",
   "slug": "aluminium",
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   "number": 14,
   "symbol": "Si",
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   "phase": "Solid",
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   "block": "p",
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  {
   "number": 15,
   "symbol": "P",
   "name": "Phosphorus",
   "slug": "phosphorus",
   "atomic_mass": 30.9737619985,
   "category": "polyatomic nonmetal",
   "phase": "Solid",
   "group": 15,
   "period": 3,
   "block": "p",
   "density": 1.823,
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   "boil": null,
   "electronegativity_pauling": 2.19,
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  {
   "number": 16,
   "symbol": "S",
   "name": "Sulfur",
   "slug": "sulfur",
   "atomic_mass": 32.06,
   "category": "polyatomic nonmetal",
   "phase": "Solid",
   "group": 16,
   "period": 3,
   "block": "p",
   "density": 2.07,
   "melt": 388.36,
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   "electronegativity_pauling": 2.58,
   "url": "https://periodicbubbles.com/element/sulfur.html",
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  {
   "number": 17,
   "symbol": "Cl",
   "name": "Chlorine",
   "slug": "chlorine",
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   "density": 3.2,
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   "number": 18,
   "symbol": "Ar",
   "name": "Argon",
   "slug": "argon",
   "atomic_mass": 39.9481,
   "category": "noble gas",
   "phase": "Gas",
   "group": 18,
   "period": 3,
   "block": "p",
   "density": 1.784,
   "melt": 83.81,
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   "url": "https://periodicbubbles.com/element/argon.html",
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  {
   "number": 19,
   "symbol": "K",
   "name": "Potassium",
   "slug": "potassium",
   "atomic_mass": 39.09831,
   "category": "alkali metal",
   "phase": "Solid",
   "group": 1,
   "period": 4,
   "block": "s",
   "density": 0.862,
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  {
   "number": 20,
   "symbol": "Ca",
   "name": "Calcium",
   "slug": "calcium",
   "atomic_mass": 40.0784,
   "category": "alkaline earth metal",
   "phase": "Solid",
   "group": 2,
   "period": 4,
   "block": "s",
   "density": 1.55,
   "melt": 1115,
   "boil": 1757,
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  {
   "number": 21,
   "symbol": "Sc",
   "name": "Scandium",
   "slug": "scandium",
   "atomic_mass": 44.9559085,
   "category": "transition metal",
   "phase": "Solid",
   "group": 3,
   "period": 4,
   "block": "d",
   "density": 2.985,
   "melt": 1814,
   "boil": 3109,
   "electronegativity_pauling": 1.36,
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  {
   "number": 22,
   "symbol": "Ti",
   "name": "Titanium",
   "slug": "titanium",
   "atomic_mass": 47.8671,
   "category": "transition metal",
   "phase": "Solid",
   "group": 4,
   "period": 4,
   "block": "d",
   "density": 4.506,
   "melt": 1941,
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  {
   "number": 23,
   "symbol": "V",
   "name": "Vanadium",
   "slug": "vanadium",
   "atomic_mass": 50.94151,
   "category": "transition metal",
   "phase": "Solid",
   "group": 5,
   "period": 4,
   "block": "d",
   "density": 6,
   "melt": 2183,
   "boil": 3680,
   "electronegativity_pauling": 1.63,
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  {
   "number": 24,
   "symbol": "Cr",
   "name": "Chromium",
   "slug": "chromium",
   "atomic_mass": 51.99616,
   "category": "transition metal",
   "phase": "Solid",
   "group": 6,
   "period": 4,
   "block": "d",
   "density": 7.19,
   "melt": 2180,
   "boil": 2944,
   "electronegativity_pauling": 1.66,
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  {
   "number": 25,
   "symbol": "Mn",
   "name": "Manganese",
   "slug": "manganese",
   "atomic_mass": 54.9380443,
   "category": "transition metal",
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   "group": 7,
   "period": 4,
   "block": "d",
   "density": 7.21,
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   "boil": 2334,
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  {
   "number": 26,
   "symbol": "Fe",
   "name": "Iron",
   "slug": "iron",
   "atomic_mass": 55.8452,
   "category": "transition metal",
   "phase": "Solid",
   "group": 8,
   "period": 4,
   "block": "d",
   "density": 7.874,
   "melt": 1811,
   "boil": 3134,
   "electronegativity_pauling": 1.83,
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  {
   "number": 27,
   "symbol": "Co",
   "name": "Cobalt",
   "slug": "cobalt",
   "atomic_mass": 58.9331944,
   "category": "transition metal",
   "phase": "Solid",
   "group": 9,
   "period": 4,
   "block": "d",
   "density": 8.9,
   "melt": 1768,
   "boil": 3200,
   "electronegativity_pauling": 1.88,
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  {
   "number": 28,
   "symbol": "Ni",
   "name": "Nickel",
   "slug": "nickel",
   "atomic_mass": 58.69344,
   "category": "transition metal",
   "phase": "Solid",
   "group": 10,
   "period": 4,
   "block": "d",
   "density": 8.908,
   "melt": 1728,
   "boil": 3003,
   "electronegativity_pauling": 1.91,
   "url": "https://periodicbubbles.com/element/nickel.html",
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  {
   "number": 29,
   "symbol": "Cu",
   "name": "Copper",
   "slug": "copper",
   "atomic_mass": 63.5463,
   "category": "transition metal",
   "phase": "Solid",
   "group": 11,
   "period": 4,
   "block": "d",
   "density": 8.96,
   "melt": 1357.77,
   "boil": 2835,
   "electronegativity_pauling": 1.9,
   "url": "https://periodicbubbles.com/element/copper.html",
   "api": "https://periodicbubbles.com/api/elements/copper.json"
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  {
   "number": 30,
   "symbol": "Zn",
   "name": "Zinc",
   "slug": "zinc",
   "atomic_mass": 65.382,
   "category": "transition metal",
   "phase": "Solid",
   "group": 12,
   "period": 4,
   "block": "d",
   "density": 7.14,
   "melt": 692.68,
   "boil": 1180,
   "electronegativity_pauling": 1.65,
   "url": "https://periodicbubbles.com/element/zinc.html",
   "api": "https://periodicbubbles.com/api/elements/zinc.json"
  },
  {
   "number": 31,
   "symbol": "Ga",
   "name": "Gallium",
   "slug": "gallium",
   "atomic_mass": 69.7231,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 13,
   "period": 4,
   "block": "p",
   "density": 5.91,
   "melt": 302.9146,
   "boil": 2673,
   "electronegativity_pauling": 1.81,
   "url": "https://periodicbubbles.com/element/gallium.html",
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  {
   "number": 32,
   "symbol": "Ge",
   "name": "Germanium",
   "slug": "germanium",
   "atomic_mass": 72.6308,
   "category": "metalloid",
   "phase": "Solid",
   "group": 14,
   "period": 4,
   "block": "p",
   "density": 5.323,
   "melt": 1211.4,
   "boil": 3106,
   "electronegativity_pauling": 2.01,
   "url": "https://periodicbubbles.com/element/germanium.html",
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  {
   "number": 33,
   "symbol": "As",
   "name": "Arsenic",
   "slug": "arsenic",
   "atomic_mass": 74.9215956,
   "category": "metalloid",
   "phase": "Solid",
   "group": 15,
   "period": 4,
   "block": "p",
   "density": 5.727,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": 2.18,
   "url": "https://periodicbubbles.com/element/arsenic.html",
   "api": "https://periodicbubbles.com/api/elements/arsenic.json"
  },
  {
   "number": 34,
   "symbol": "Se",
   "name": "Selenium",
   "slug": "selenium",
   "atomic_mass": 78.9718,
   "category": "polyatomic nonmetal",
   "phase": "Solid",
   "group": 16,
   "period": 4,
   "block": "p",
   "density": 4.81,
   "melt": 494,
   "boil": 958,
   "electronegativity_pauling": 2.55,
   "url": "https://periodicbubbles.com/element/selenium.html",
   "api": "https://periodicbubbles.com/api/elements/selenium.json"
  },
  {
   "number": 35,
   "symbol": "Br",
   "name": "Bromine",
   "slug": "bromine",
   "atomic_mass": 79.904,
   "category": "diatomic nonmetal",
   "phase": "Liquid",
   "group": 17,
   "period": 4,
   "block": "p",
   "density": 3.1028,
   "melt": 265.8,
   "boil": 332,
   "electronegativity_pauling": 2.96,
   "url": "https://periodicbubbles.com/element/bromine.html",
   "api": "https://periodicbubbles.com/api/elements/bromine.json"
  },
  {
   "number": 36,
   "symbol": "Kr",
   "name": "Krypton",
   "slug": "krypton",
   "atomic_mass": 83.7982,
   "category": "noble gas",
   "phase": "Gas",
   "group": 18,
   "period": 4,
   "block": "p",
   "density": 3.749,
   "melt": 115.78,
   "boil": 119.93,
   "electronegativity_pauling": 3,
   "url": "https://periodicbubbles.com/element/krypton.html",
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  {
   "number": 37,
   "symbol": "Rb",
   "name": "Rubidium",
   "slug": "rubidium",
   "atomic_mass": 85.46783,
   "category": "alkali metal",
   "phase": "Solid",
   "group": 1,
   "period": 5,
   "block": "s",
   "density": 1.532,
   "melt": 312.45,
   "boil": 961,
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   "url": "https://periodicbubbles.com/element/rubidium.html",
   "api": "https://periodicbubbles.com/api/elements/rubidium.json"
  },
  {
   "number": 38,
   "symbol": "Sr",
   "name": "Strontium",
   "slug": "strontium",
   "atomic_mass": 87.621,
   "category": "alkaline earth metal",
   "phase": "Solid",
   "group": 2,
   "period": 5,
   "block": "s",
   "density": 2.64,
   "melt": 1050,
   "boil": 1650,
   "electronegativity_pauling": 0.95,
   "url": "https://periodicbubbles.com/element/strontium.html",
   "api": "https://periodicbubbles.com/api/elements/strontium.json"
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  {
   "number": 39,
   "symbol": "Y",
   "name": "Yttrium",
   "slug": "yttrium",
   "atomic_mass": 88.905842,
   "category": "transition metal",
   "phase": "Solid",
   "group": 3,
   "period": 5,
   "block": "d",
   "density": 4.472,
   "melt": 1799,
   "boil": 3203,
   "electronegativity_pauling": 1.22,
   "url": "https://periodicbubbles.com/element/yttrium.html",
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  },
  {
   "number": 40,
   "symbol": "Zr",
   "name": "Zirconium",
   "slug": "zirconium",
   "atomic_mass": 91.2242,
   "category": "transition metal",
   "phase": "Solid",
   "group": 4,
   "period": 5,
   "block": "d",
   "density": 6.52,
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   "number": 41,
   "symbol": "Nb",
   "name": "Niobium",
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   "number": 42,
   "symbol": "Mo",
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   "number": 43,
   "symbol": "Tc",
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   "number": 44,
   "symbol": "Ru",
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   "number": 45,
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   "number": 46,
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   "name": "Palladium",
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   "number": 48,
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   "number": 49,
   "symbol": "In",
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   "number": 50,
   "symbol": "Sn",
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   "number": 51,
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   "number": 52,
   "symbol": "Te",
   "name": "Tellurium",
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   "symbol": "I",
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   "number": 54,
   "symbol": "Xe",
   "name": "Xenon",
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   "number": 55,
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   "number": 56,
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   "number": 57,
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   "name": "Lanthanum",
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   "number": 58,
   "symbol": "Ce",
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   "number": 59,
   "symbol": "Pr",
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   "number": 60,
   "symbol": "Nd",
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   "number": 61,
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   "number": 62,
   "symbol": "Sm",
   "name": "Samarium",
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   "number": 63,
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   "number": 64,
   "symbol": "Gd",
   "name": "Gadolinium",
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   "number": 65,
   "symbol": "Tb",
   "name": "Terbium",
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   "number": 66,
   "symbol": "Dy",
   "name": "Dysprosium",
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   "number": 67,
   "symbol": "Ho",
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   "number": 68,
   "symbol": "Er",
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   "number": 69,
   "symbol": "Tm",
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   "number": 70,
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   "number": 71,
   "symbol": "Lu",
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   "number": 72,
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   "number": 73,
   "symbol": "Ta",
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   "number": 74,
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   "number": 75,
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   "number": 76,
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   "number": 77,
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   "number": 80,
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   "electronegativity_pauling": 2,
   "url": "https://periodicbubbles.com/element/mercury.html",
   "api": "https://periodicbubbles.com/api/elements/mercury.json"
  },
  {
   "number": 81,
   "symbol": "Tl",
   "name": "Thallium",
   "slug": "thallium",
   "atomic_mass": 204.38,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 13,
   "period": 6,
   "block": "p",
   "density": 11.85,
   "melt": 577,
   "boil": 1746,
   "electronegativity_pauling": 1.62,
   "url": "https://periodicbubbles.com/element/thallium.html",
   "api": "https://periodicbubbles.com/api/elements/thallium.json"
  },
  {
   "number": 82,
   "symbol": "Pb",
   "name": "Lead",
   "slug": "lead",
   "atomic_mass": 207.21,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 14,
   "period": 6,
   "block": "p",
   "density": 11.34,
   "melt": 600.61,
   "boil": 2022,
   "electronegativity_pauling": 1.87,
   "url": "https://periodicbubbles.com/element/lead.html",
   "api": "https://periodicbubbles.com/api/elements/lead.json"
  },
  {
   "number": 83,
   "symbol": "Bi",
   "name": "Bismuth",
   "slug": "bismuth",
   "atomic_mass": 208.980401,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 15,
   "period": 6,
   "block": "p",
   "density": 9.78,
   "melt": 544.7,
   "boil": 1837,
   "electronegativity_pauling": 2.02,
   "url": "https://periodicbubbles.com/element/bismuth.html",
   "api": "https://periodicbubbles.com/api/elements/bismuth.json"
  },
  {
   "number": 84,
   "symbol": "Po",
   "name": "Polonium",
   "slug": "polonium",
   "atomic_mass": 209,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 16,
   "period": 6,
   "block": "p",
   "density": 9.196,
   "melt": 527,
   "boil": 1235,
   "electronegativity_pauling": 2,
   "url": "https://periodicbubbles.com/element/polonium.html",
   "api": "https://periodicbubbles.com/api/elements/polonium.json"
  },
  {
   "number": 85,
   "symbol": "At",
   "name": "Astatine",
   "slug": "astatine",
   "atomic_mass": 210,
   "category": "metalloid",
   "phase": "Solid",
   "group": 17,
   "period": 6,
   "block": "p",
   "density": 6.35,
   "melt": 575,
   "boil": 610,
   "electronegativity_pauling": 2.2,
   "url": "https://periodicbubbles.com/element/astatine.html",
   "api": "https://periodicbubbles.com/api/elements/astatine.json"
  },
  {
   "number": 86,
   "symbol": "Rn",
   "name": "Radon",
   "slug": "radon",
   "atomic_mass": 222,
   "category": "noble gas",
   "phase": "Gas",
   "group": 18,
   "period": 6,
   "block": "p",
   "density": 9.73,
   "melt": 202,
   "boil": 211.5,
   "electronegativity_pauling": 2.2,
   "url": "https://periodicbubbles.com/element/radon.html",
   "api": "https://periodicbubbles.com/api/elements/radon.json"
  },
  {
   "number": 87,
   "symbol": "Fr",
   "name": "Francium",
   "slug": "francium",
   "atomic_mass": 223,
   "category": "alkali metal",
   "phase": "Solid",
   "group": 1,
   "period": 7,
   "block": "s",
   "density": 1.87,
   "melt": 300,
   "boil": 950,
   "electronegativity_pauling": 0.79,
   "url": "https://periodicbubbles.com/element/francium.html",
   "api": "https://periodicbubbles.com/api/elements/francium.json"
  },
  {
   "number": 88,
   "symbol": "Ra",
   "name": "Radium",
   "slug": "radium",
   "atomic_mass": 226,
   "category": "alkaline earth metal",
   "phase": "Solid",
   "group": 2,
   "period": 7,
   "block": "s",
   "density": 5.5,
   "melt": 1233,
   "boil": 2010,
   "electronegativity_pauling": 0.9,
   "url": "https://periodicbubbles.com/element/radium.html",
   "api": "https://periodicbubbles.com/api/elements/radium.json"
  },
  {
   "number": 89,
   "symbol": "Ac",
   "name": "Actinium",
   "slug": "actinium",
   "atomic_mass": 227,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 10,
   "melt": 1500,
   "boil": 3500,
   "electronegativity_pauling": 1.1,
   "url": "https://periodicbubbles.com/element/actinium.html",
   "api": "https://periodicbubbles.com/api/elements/actinium.json"
  },
  {
   "number": 90,
   "symbol": "Th",
   "name": "Thorium",
   "slug": "thorium",
   "atomic_mass": 232.03774,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 11.724,
   "melt": 2023,
   "boil": 5061,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/thorium.html",
   "api": "https://periodicbubbles.com/api/elements/thorium.json"
  },
  {
   "number": 91,
   "symbol": "Pa",
   "name": "Protactinium",
   "slug": "protactinium",
   "atomic_mass": 231.035882,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 15.37,
   "melt": 1841,
   "boil": 4300,
   "electronegativity_pauling": 1.5,
   "url": "https://periodicbubbles.com/element/protactinium.html",
   "api": "https://periodicbubbles.com/api/elements/protactinium.json"
  },
  {
   "number": 92,
   "symbol": "U",
   "name": "Uranium",
   "slug": "uranium",
   "atomic_mass": 238.028913,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 19.1,
   "melt": 1405.3,
   "boil": 4404,
   "electronegativity_pauling": 1.38,
   "url": "https://periodicbubbles.com/element/uranium.html",
   "api": "https://periodicbubbles.com/api/elements/uranium.json"
  },
  {
   "number": 93,
   "symbol": "Np",
   "name": "Neptunium",
   "slug": "neptunium",
   "atomic_mass": 237,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 20.45,
   "melt": 912,
   "boil": 4447,
   "electronegativity_pauling": 1.36,
   "url": "https://periodicbubbles.com/element/neptunium.html",
   "api": "https://periodicbubbles.com/api/elements/neptunium.json"
  },
  {
   "number": 94,
   "symbol": "Pu",
   "name": "Plutonium",
   "slug": "plutonium",
   "atomic_mass": 244,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 19.816,
   "melt": 912.5,
   "boil": 3505,
   "electronegativity_pauling": 1.28,
   "url": "https://periodicbubbles.com/element/plutonium.html",
   "api": "https://periodicbubbles.com/api/elements/plutonium.json"
  },
  {
   "number": 95,
   "symbol": "Am",
   "name": "Americium",
   "slug": "americium",
   "atomic_mass": 243,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 12,
   "melt": 1449,
   "boil": 2880,
   "electronegativity_pauling": 1.13,
   "url": "https://periodicbubbles.com/element/americium.html",
   "api": "https://periodicbubbles.com/api/elements/americium.json"
  },
  {
   "number": 96,
   "symbol": "Cm",
   "name": "Curium",
   "slug": "curium",
   "atomic_mass": 247,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 13.51,
   "melt": 1613,
   "boil": 3383,
   "electronegativity_pauling": 1.28,
   "url": "https://periodicbubbles.com/element/curium.html",
   "api": "https://periodicbubbles.com/api/elements/curium.json"
  },
  {
   "number": 97,
   "symbol": "Bk",
   "name": "Berkelium",
   "slug": "berkelium",
   "atomic_mass": 247,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 14.78,
   "melt": 1259,
   "boil": 2900,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/berkelium.html",
   "api": "https://periodicbubbles.com/api/elements/berkelium.json"
  },
  {
   "number": 98,
   "symbol": "Cf",
   "name": "Californium",
   "slug": "californium",
   "atomic_mass": 251,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 15.1,
   "melt": 1173,
   "boil": 1743,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/californium.html",
   "api": "https://periodicbubbles.com/api/elements/californium.json"
  },
  {
   "number": 99,
   "symbol": "Es",
   "name": "Einsteinium",
   "slug": "einsteinium",
   "atomic_mass": 252,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": 8.84,
   "melt": 1133,
   "boil": 1269,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/einsteinium.html",
   "api": "https://periodicbubbles.com/api/elements/einsteinium.json"
  },
  {
   "number": 100,
   "symbol": "Fm",
   "name": "Fermium",
   "slug": "fermium",
   "atomic_mass": 257,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": null,
   "melt": 1800,
   "boil": null,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/fermium.html",
   "api": "https://periodicbubbles.com/api/elements/fermium.json"
  },
  {
   "number": 101,
   "symbol": "Md",
   "name": "Mendelevium",
   "slug": "mendelevium",
   "atomic_mass": 258,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": null,
   "melt": 1100,
   "boil": null,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/mendelevium.html",
   "api": "https://periodicbubbles.com/api/elements/mendelevium.json"
  },
  {
   "number": 102,
   "symbol": "No",
   "name": "Nobelium",
   "slug": "nobelium",
   "atomic_mass": 259,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "f",
   "density": null,
   "melt": 1100,
   "boil": null,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/nobelium.html",
   "api": "https://periodicbubbles.com/api/elements/nobelium.json"
  },
  {
   "number": 103,
   "symbol": "Lr",
   "name": "Lawrencium",
   "slug": "lawrencium",
   "atomic_mass": 266,
   "category": "actinide",
   "phase": "Solid",
   "group": 3,
   "period": 7,
   "block": "d",
   "density": null,
   "melt": 1900,
   "boil": null,
   "electronegativity_pauling": 1.3,
   "url": "https://periodicbubbles.com/element/lawrencium.html",
   "api": "https://periodicbubbles.com/api/elements/lawrencium.json"
  },
  {
   "number": 104,
   "symbol": "Rf",
   "name": "Rutherfordium",
   "slug": "rutherfordium",
   "atomic_mass": 267,
   "category": "transition metal",
   "phase": "Solid",
   "group": 4,
   "period": 7,
   "block": "d",
   "density": 23.2,
   "melt": 2400,
   "boil": 5800,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/rutherfordium.html",
   "api": "https://periodicbubbles.com/api/elements/rutherfordium.json"
  },
  {
   "number": 105,
   "symbol": "Db",
   "name": "Dubnium",
   "slug": "dubnium",
   "atomic_mass": 268,
   "category": "transition metal",
   "phase": "Solid",
   "group": 5,
   "period": 7,
   "block": "d",
   "density": 29.3,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/dubnium.html",
   "api": "https://periodicbubbles.com/api/elements/dubnium.json"
  },
  {
   "number": 106,
   "symbol": "Sg",
   "name": "Seaborgium",
   "slug": "seaborgium",
   "atomic_mass": 269,
   "category": "transition metal",
   "phase": "Solid",
   "group": 6,
   "period": 7,
   "block": "d",
   "density": 35,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/seaborgium.html",
   "api": "https://periodicbubbles.com/api/elements/seaborgium.json"
  },
  {
   "number": 107,
   "symbol": "Bh",
   "name": "Bohrium",
   "slug": "bohrium",
   "atomic_mass": 270,
   "category": "transition metal",
   "phase": "Solid",
   "group": 7,
   "period": 7,
   "block": "d",
   "density": 37.1,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/bohrium.html",
   "api": "https://periodicbubbles.com/api/elements/bohrium.json"
  },
  {
   "number": 108,
   "symbol": "Hs",
   "name": "Hassium",
   "slug": "hassium",
   "atomic_mass": 269,
   "category": "transition metal",
   "phase": "Solid",
   "group": 8,
   "period": 7,
   "block": "d",
   "density": 40.7,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/hassium.html",
   "api": "https://periodicbubbles.com/api/elements/hassium.json"
  },
  {
   "number": 109,
   "symbol": "Mt",
   "name": "Meitnerium",
   "slug": "meitnerium",
   "atomic_mass": 278,
   "category": "unknown, probably transition metal",
   "phase": "Solid",
   "group": 9,
   "period": 7,
   "block": "d",
   "density": 37.4,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/meitnerium.html",
   "api": "https://periodicbubbles.com/api/elements/meitnerium.json"
  },
  {
   "number": 110,
   "symbol": "Ds",
   "name": "Darmstadtium",
   "slug": "darmstadtium",
   "atomic_mass": 281,
   "category": "unknown, probably transition metal",
   "phase": "Solid",
   "group": 10,
   "period": 7,
   "block": "d",
   "density": 34.8,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/darmstadtium.html",
   "api": "https://periodicbubbles.com/api/elements/darmstadtium.json"
  },
  {
   "number": 111,
   "symbol": "Rg",
   "name": "Roentgenium",
   "slug": "roentgenium",
   "atomic_mass": 282,
   "category": "unknown, probably transition metal",
   "phase": "Solid",
   "group": 11,
   "period": 7,
   "block": "d",
   "density": 28.7,
   "melt": null,
   "boil": null,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/roentgenium.html",
   "api": "https://periodicbubbles.com/api/elements/roentgenium.json"
  },
  {
   "number": 112,
   "symbol": "Cn",
   "name": "Copernicium",
   "slug": "copernicium",
   "atomic_mass": 285,
   "category": "transition metal",
   "phase": "Liquid",
   "group": 12,
   "period": 7,
   "block": "d",
   "density": 14.0,
   "melt": null,
   "boil": 357,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/copernicium.html",
   "api": "https://periodicbubbles.com/api/elements/copernicium.json"
  },
  {
   "number": 113,
   "symbol": "Nh",
   "name": "Nihonium",
   "slug": "nihonium",
   "atomic_mass": 286,
   "category": "unknown, probably transition metal",
   "phase": "Solid",
   "group": 13,
   "period": 7,
   "block": "p",
   "density": 16,
   "melt": 700,
   "boil": 1430,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/nihonium.html",
   "api": "https://periodicbubbles.com/api/elements/nihonium.json"
  },
  {
   "number": 114,
   "symbol": "Fl",
   "name": "Flerovium",
   "slug": "flerovium",
   "atomic_mass": 289,
   "category": "post-transition metal",
   "phase": "Solid",
   "group": 14,
   "period": 7,
   "block": "p",
   "density": 14,
   "melt": 340,
   "boil": 420,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/flerovium.html",
   "api": "https://periodicbubbles.com/api/elements/flerovium.json"
  },
  {
   "number": 115,
   "symbol": "Mc",
   "name": "Moscovium",
   "slug": "moscovium",
   "atomic_mass": 289,
   "category": "unknown, probably post-transition metal",
   "phase": "Solid",
   "group": 15,
   "period": 7,
   "block": "p",
   "density": 13.5,
   "melt": 670,
   "boil": 1400,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/moscovium.html",
   "api": "https://periodicbubbles.com/api/elements/moscovium.json"
  },
  {
   "number": 116,
   "symbol": "Lv",
   "name": "Livermorium",
   "slug": "livermorium",
   "atomic_mass": 293,
   "category": "unknown, probably post-transition metal",
   "phase": "Solid",
   "group": 16,
   "period": 7,
   "block": "p",
   "density": 12.9,
   "melt": 709,
   "boil": 1085,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/livermorium.html",
   "api": "https://periodicbubbles.com/api/elements/livermorium.json"
  },
  {
   "number": 117,
   "symbol": "Ts",
   "name": "Tennessine",
   "slug": "tennessine",
   "atomic_mass": 294,
   "category": "unknown, probably metalloid",
   "phase": "Solid",
   "group": 17,
   "period": 7,
   "block": "p",
   "density": 7.17,
   "melt": 723,
   "boil": 883,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/tennessine.html",
   "api": "https://periodicbubbles.com/api/elements/tennessine.json"
  },
  {
   "number": 118,
   "symbol": "Og",
   "name": "Oganesson",
   "slug": "oganesson",
   "atomic_mass": 294,
   "category": "unknown, predicted to be noble gas",
   "phase": "Solid",
   "group": 18,
   "period": 7,
   "block": "p",
   "density": 4.95,
   "melt": null,
   "boil": 350,
   "electronegativity_pauling": null,
   "url": "https://periodicbubbles.com/element/oganesson.html",
   "api": "https://periodicbubbles.com/api/elements/oganesson.json"
  }
 ]
}