[
  {
    "element_name": "hydrogen",
    "element_symbol": "H",
    "element_number": 1,
    "atomic_weight": "[1.007 84, 1.008 11]"
  },
  {
    "element_name": "helium",
    "element_symbol": "He",
    "element_number": 2,
    "atomic_weight": "4.002 602(2)"
  },
  {
    "element_name": "lithium",
    "element_symbol": "Li",
    "element_number": 3,
    "atomic_weight": "[6.938, 6.997]"
  },
  {
    "element_name": "beryllium",
    "element_symbol": "Be",
    "element_number": 4,
    "atomic_weight": "9.012 1831(5)"
  },
  {
    "element_name": "boron",
    "element_symbol": "B",
    "element_number": 5,
    "atomic_weight": "[10.806, 10.821]"
  },
  {
    "element_name": "carbon",
    "element_symbol": "C",
    "element_number": 6,
    "atomic_weight": "[12.0096, 12.0116]"
  },
  {
    "element_name": "nitrogen",
    "element_symbol": "N",
    "element_number": 7,
    "atomic_weight": "[14.006 43, 14.007 28]"
  },
  {
    "element_name": "oxygen",
    "element_symbol": "O",
    "element_number": 8,
    "atomic_weight": "[15.999 03, 15.999 77]"
  },
  {
    "element_name": "fluorine",
    "element_symbol": "F",
    "element_number": 9,
    "atomic_weight": "18.998 403 163(6)"
  },
  {
    "element_name": "neon",
    "element_symbol": "Ne",
    "element_number": 10,
    "atomic_weight": "20.1797(6)"
  },
  {
    "element_name": "sodium",
    "element_symbol": "Na",
    "element_number": 11,
    "atomic_weight": "22.989 769 28(2)"
  },
  {
    "element_name": "magnesium",
    "element_symbol": "Mg",
    "element_number": 12,
    "atomic_weight": "[24.304, 24.307]"
  },
  {
    "element_name": "aluminium",
    "element_symbol": "Al",
    "element_number": 13,
    "atomic_weight": "26.981 5385(7)",
    "_synonyms": [{
      "category": "element name",
      "fact" : "aluminium",
      "synonyms": [
        "aluminum"
        ]
      }
    ]
  },
  {
    "element_name": "silicon",
    "element_symbol": "Si",
    "element_number": 14,
    "atomic_weight": "[28.084, 28.086]"
  },
  {
    "element_name": "phosphorus",
    "element_symbol": "P",
    "element_number": 15,
    "atomic_weight": "30.973 761 998(5)"
  },
  {
    "element_name": "sulfur",
    "element_symbol": "S",
    "element_number": 16,
    "atomic_weight": "[32.059, 32.076]"
  },
  {
    "element_name": "chlorine",
    "element_symbol": "Cl",
    "element_number": 17,
    "atomic_weight": "[35.446, 35.457]"
  },
  {
    "element_name": "argon",
    "element_symbol": "Ar",
    "element_number": 18,
    "atomic_weight": "39.948(1)"
  },
  {
    "element_name": "potassium",
    "element_symbol": "K",
    "element_number": 19,
    "atomic_weight": "39.0983(1)"
  },
  {
    "element_name": "calcium",
    "element_symbol": "Ca",
    "element_number": 20,
    "atomic_weight": "40.078(4)"
  },
  {
    "element_name": "scandium",
    "element_symbol": "Sc",
    "element_number": 21,
    "atomic_weight": "44.955 908(5)"
  },
  {
    "element_name": "titanium",
    "element_symbol": "Ti",
    "element_number": 22,
    "atomic_weight": "47.867(1)"
  },
  {
    "element_name": "vanadium",
    "element_symbol": "V",
    "element_number": 23,
    "atomic_weight": "50.9415(1)"
  },
  {
    "element_name": "chromium",
    "element_symbol": "Cr",
    "element_number": 24,
    "atomic_weight": "51.9961(6)"
  },
  {
    "element_name": "manganese",
    "element_symbol": "Mn",
    "element_number": 25,
    "atomic_weight": "54.938 044(3)"
  },
  {
    "element_name": "iron",
    "element_symbol": "Fe",
    "element_number": 26,
    "atomic_weight": "55.845(2)"
  },
  {
    "element_name": "cobalt",
    "element_symbol": "Co",
    "element_number": 27,
    "atomic_weight": "58.933 194(4)"
  },
  {
    "element_name": "nickel",
    "element_symbol": "Ni",
    "element_number": 28,
    "atomic_weight": "58.6934(4)"
  },
  {
    "element_name": "copper",
    "element_symbol": "Cu",
    "element_number": 29,
    "atomic_weight": "63.546(3)"
  },
  {
    "element_name": "zinc",
    "element_symbol": "Zn",
    "element_number": 30,
    "atomic_weight": "65.38(2)"
  },
  {
    "element_name": "gallium",
    "element_symbol": "Ga",
    "element_number": 31,
    "atomic_weight": "69.723(1)"
  },
  {
    "element_name": "germanium",
    "element_symbol": "Ge",
    "element_number": 32,
    "atomic_weight": "72.630(8)"
  },
  {
    "element_name": "arsenic",
    "element_symbol": "As",
    "element_number": 33,
    "atomic_weight": "74.921 595(6)"
  },
  {
    "element_name": "selenium",
    "element_symbol": "Se",
    "element_number": 34,
    "atomic_weight": "78.971(8)"
  },
  {
    "element_name": "bromine",
    "element_symbol": "Br",
    "element_number": 35,
    "atomic_weight": "[79.901, 79.907]"
  },
  {
    "element_name": "krypton",
    "element_symbol": "Kr",
    "element_number": 36,
    "atomic_weight": "83.798(2)"
  },
  {
    "element_name": "rubidium",
    "element_symbol": "Rb",
    "element_number": 37,
    "atomic_weight": "85.4678(3)"
  },
  {
    "element_name": "strontium",
    "element_symbol": "Sr",
    "element_number": 38,
    "atomic_weight": "87.62(1)"
  },
  {
    "element_name": "yttrium",
    "element_symbol": "Y",
    "element_number": 39,
    "atomic_weight": "88.905 84(2)"
  },
  {
    "element_name": "zirconium",
    "element_symbol": "Zr",
    "element_number": 40,
    "atomic_weight": "91.224(2)"
  },
  {
    "element_name": "niobium",
    "element_symbol": "Nb",
    "element_number": 41,
    "atomic_weight": "92.906 37(2)"
  },
  {
    "element_name": "molybdenum",
    "element_symbol": "Mo",
    "element_number": 42,
    "atomic_weight": "95.95(1)"
  },
  {
    "element_name": "technetium",
    "element_symbol": "Tc",
    "element_number": 43,
    "atomic_weight": "–"
  },
  {
    "element_name": "ruthenium",
    "element_symbol": "Ru",
    "element_number": 44,
    "atomic_weight": "101.07(2)"
  },
  {
    "element_name": "rhodium",
    "element_symbol": "Rh",
    "element_number": 45,
    "atomic_weight": "102.905 50(2)"
  },
  {
    "element_name": "palladium",
    "element_symbol": "Pd",
    "element_number": 46,
    "atomic_weight": "106.42(1)"
  },
  {
    "element_name": "silver",
    "element_symbol": "Ag",
    "element_number": 47,
    "atomic_weight": "107.8682(2)"
  },
  {
    "element_name": "cadmium",
    "element_symbol": "Cd",
    "element_number": 48,
    "atomic_weight": "112.414(4)"
  },
  {
    "element_name": "indium",
    "element_symbol": "In",
    "element_number": 49,
    "atomic_weight": "114.818(1)"
  },
  {
    "element_name": "tin",
    "element_symbol": "Sn",
    "element_number": 50,
    "atomic_weight": "118.710(7)"
  },
  {
    "element_name": "antimony",
    "element_symbol": "Sb",
    "element_number": 51,
    "atomic_weight": "121.760(1)"
  },
  {
    "element_name": "tellurium",
    "element_symbol": "Te",
    "element_number": 52,
    "atomic_weight": "127.60(3)"
  },
  {
    "element_name": "iodine",
    "element_symbol": "I",
    "element_number": 53,
    "atomic_weight": "126.904 47(3)"
  },
  {
    "element_name": "xenon",
    "element_symbol": "Xe",
    "element_number": 54,
    "atomic_weight": "131.293(6)"
  },
  {
    "element_name": "caesium",
    "element_symbol": "Cs",
    "element_number": 55,
    "atomic_weight": "132.905 451 96(6)",
    "_synonyms": [{
      "category": "element name",
      "fact" : "caesium",
      "synonyms" : [
        "cesium"
      ]
    }]
  },
  {
    "element_name": "barium",
    "element_symbol": "Ba",
    "element_number": 56,
    "atomic_weight": "137.327(7)"
  },
  {
    "element_name": "lanthanum",
    "element_symbol": "La",
    "element_number": 57,
    "atomic_weight": "138.905 47(7)"
  },
  {
    "element_name": "cerium",
    "element_symbol": "Ce",
    "element_number": 58,
    "atomic_weight": "140.116(1)"
  },
  {
    "element_name": "praseodymium",
    "element_symbol": "Pr",
    "element_number": 59,
    "atomic_weight": "140.907 66(2)"
  },
  {
    "element_name": "neodymium",
    "element_symbol": "Nd",
    "element_number": 60,
    "atomic_weight": "144.242(3)"
  },
  {
    "element_name": "promethium",
    "element_symbol": "Pm",
    "element_number": 61,
    "atomic_weight": "–"
  },
  {
    "element_name": "samarium",
    "element_symbol": "Sm",
    "element_number": 62,
    "atomic_weight": "150.36(2)"
  },
  {
    "element_name": "europium",
    "element_symbol": "Eu",
    "element_number": 63,
    "atomic_weight": "151.964(1)"
  },
  {
    "element_name": "gadolinium",
    "element_symbol": "Gd",
    "element_number": 64,
    "atomic_weight": "157.25(3)"
  },
  {
    "element_name": "terbium",
    "element_symbol": "Tb",
    "element_number": 65,
    "atomic_weight": "158.925 35(2)"
  },
  {
    "element_name": "dysprosium",
    "element_symbol": "Dy",
    "element_number": 66,
    "atomic_weight": "162.500(1)"
  },
  {
    "element_name": "holmium",
    "element_symbol": "Ho",
    "element_number": 67,
    "atomic_weight": "164.930 33(2)"
  },
  {
    "element_name": "erbium",
    "element_symbol": "Er",
    "element_number": 68,
    "atomic_weight": "167.259(3)"
  },
  {
    "element_name": "thulium",
    "element_symbol": "Tm",
    "element_number": 69,
    "atomic_weight": "168.934 22(2)"
  },
  {
    "element_name": "ytterbium",
    "element_symbol": "Yb",
    "element_number": 70,
    "atomic_weight": "173.054(5)"
  },
  {
    "element_name": "lutetium",
    "element_symbol": "Lu",
    "element_number": 71,
    "atomic_weight": "174.9668(1)"
  },
  {
    "element_name": "hafnium",
    "element_symbol": "Hf",
    "element_number": 72,
    "atomic_weight": "178.49(2)"
  },
  {
    "element_name": "tantalum",
    "element_symbol": "Ta",
    "element_number": 73,
    "atomic_weight": "180.947 88(2)"
  },
  {
    "element_name": "tungsten",
    "element_symbol": "W",
    "element_number": 74,
    "atomic_weight": "183.84(1)"
  },
  {
    "element_name": "rhenium",
    "element_symbol": "Re",
    "element_number": 75,
    "atomic_weight": "186.207(1)"
  },
  {
    "element_name": "osmium",
    "element_symbol": "Os",
    "element_number": 76,
    "atomic_weight": "190.23(3)"
  },
  {
    "element_name": "iridium",
    "element_symbol": "Ir",
    "element_number": 77,
    "atomic_weight": "192.217(3)"
  },
  {
    "element_name": "platinum",
    "element_symbol": "Pt",
    "element_number": 78,
    "atomic_weight": "195.084(9)"
  },
  {
    "element_name": "gold",
    "element_symbol": "Au",
    "element_number": 79,
    "atomic_weight": "196.966 569(5)"
  },
  {
    "element_name": "mercury",
    "element_symbol": "Hg",
    "element_number": 80,
    "atomic_weight": "200.592(3)"
  },
  {
    "element_name": "thallium",
    "element_symbol": "Tl",
    "element_number": 81,
    "atomic_weight": "[204.382, 204.385]"
  },
  {
    "element_name": "lead",
    "element_symbol": "Pb",
    "element_number": 82,
    "atomic_weight": "207.2(1)"
  },
  {
    "element_name": "bismuth",
    "element_symbol": "Bi",
    "element_number": 83,
    "atomic_weight": "208.980 40(1)"
  },
  {
    "element_name": "polonium",
    "element_symbol": "Po",
    "element_number": 84,
    "atomic_weight": "–"
  },
  {
    "element_name": "astatine",
    "element_symbol": "At",
    "element_number": 85,
    "atomic_weight": "–"
  },
  {
    "element_name": "radon",
    "element_symbol": "Rn",
    "element_number": 86,
    "atomic_weight": "–"
  },
  {
    "element_name": "francium",
    "element_symbol": "Fr",
    "element_number": 87,
    "atomic_weight": "–"
  },
  {
    "element_name": "radium",
    "element_symbol": "Ra",
    "element_number": 88,
    "atomic_weight": "–"
  },
  {
    "element_name": "actinium",
    "element_symbol": "Ac",
    "element_number": 89,
    "atomic_weight": "–"
  },
  {
    "element_name": "thorium",
    "element_symbol": "Th",
    "element_number": 90,
    "atomic_weight": "232.0377(4)"
  },
  {
    "element_name": "protactinium",
    "element_symbol": "Pa",
    "element_number": 91,
    "atomic_weight": "231.035 88(2)"
  },
  {
    "element_name": "uranium",
    "element_symbol": "U",
    "element_number": 92,
    "atomic_weight": "238.028 91(3)"
  },
  {
    "element_name": "neptunium",
    "element_symbol": "Np",
    "element_number": 93,
    "atomic_weight": "–"
  },
  {
    "element_name": "plutonium",
    "element_symbol": "Pu",
    "element_number": 94,
    "atomic_weight": "–"
  },
  {
    "element_name": "americium",
    "element_symbol": "Am",
    "element_number": 95,
    "atomic_weight": "–"
  },
  {
    "element_name": "curium",
    "element_symbol": "Cm",
    "element_number": 96,
    "atomic_weight": "–"
  },
  {
    "element_name": "berkelium",
    "element_symbol": "Bk",
    "element_number": 97,
    "atomic_weight": "–"
  },
  {
    "element_name": "californium",
    "element_symbol": "Cf",
    "element_number": 98,
    "atomic_weight": "–"
  },
  {
    "element_name": "einsteinium",
    "element_symbol": "Es",
    "element_number": 99,
    "atomic_weight": "–"
  },
  {
    "element_name": "fermium",
    "element_symbol": "Fm",
    "element_number": 100,
    "atomic_weight": "–"
  },
  {
    "element_name": "mendelevium",
    "element_symbol": "Md",
    "element_number": 101,
    "atomic_weight": "–"
  },
  {
    "element_name": "nobelium",
    "element_symbol": "No",
    "element_number": 102,
    "atomic_weight": "–"
  },
  {
    "element_name": "lawrencium",
    "element_symbol": "Lr",
    "element_number": 103,
    "atomic_weight": "–"
  },
  {
    "element_name": "rutherfordium",
    "element_symbol": "Rf",
    "element_number": 104,
    "atomic_weight": "–"
  },
  {
    "element_name": "dubnium",
    "element_symbol": "Db",
    "element_number": 105,
    "atomic_weight": "–"
  },
  {
    "element_name": "seaborgium",
    "element_symbol": "Sg",
    "element_number": 106,
    "atomic_weight": "–"
  },
  {
    "element_name": "bohrium",
    "element_symbol": "Bh",
    "element_number": 107,
    "atomic_weight": "–"
  },
  {
    "element_name": "hassium",
    "element_symbol": "Hs",
    "element_number": 108,
    "atomic_weight": "–"
  },
  {
    "element_name": "meitnerium",
    "element_symbol": "Mt",
    "element_number": 109,
    "atomic_weight": "–"
  },
  {
    "element_name": "darmstadtium",
    "element_symbol": "Ds",
    "element_number": 110,
    "atomic_weight": "–"
  },
  {
    "element_name": "roentgenium",
    "element_symbol": "Rg",
    "element_number": 111,
    "atomic_weight": "–"
  },
  {
    "element_name": "copernicium",
    "element_symbol": "Cn",
    "element_number": 112,
    "atomic_weight": "–"
  },
  {
    "element_name": "nihonium",
    "element_symbol": "Nh",
    "element_number": 113,
    "atomic_weight": "–"
  },
  {
    "element_name": "flerovium",
    "element_symbol": "Fl",
    "element_number": 114,
    "atomic_weight": "–"
  },
  {
    "element_name": "moscovium",
    "element_symbol": "Mc",
    "element_number": 115,
    "atomic_weight": "–"
  },
  {
    "element_name": "livermorium",
    "element_symbol": "Lv",
    "element_number": 116,
    "atomic_weight": "–"
  },
  {
    "element_name": "tennesine",
    "element_symbol": "Ts",
    "element_number": 117,
    "atomic_weight": "–"
  },
  {
    "element_name": "oganesson",
    "element_symbol": "Og",
    "element_number": 118,
    "atomic_weight": "–"
  }
]