{
  "retrieved": "2026-10-23",
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        "abundance": 0.0008881,
        "source": "NIST"
      }
    ],
    "58": [
      {
        "massNumber": 140,
        "abundance": 0.8845,
        "source": "NIST"
      },
      {
        "massNumber": 142,
        "abundance": 0.11114,
        "source": "NIST"
      },
      {
        "massNumber": 138,
        "abundance": 0.00251,
        "source": "NIST"
      },
      {
        "massNumber": 136,
        "abundance": 0.00185,
        "source": "NIST"
      }
    ],
    "59": [
      {
        "massNumber": 141,
        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "60": [
      {
        "massNumber": 142,
        "abundance": 0.27152,
        "source": "NIST"
      },
      {
        "massNumber": 144,
        "abundance": 0.23798,
        "source": "NIST"
      },
      {
        "massNumber": 146,
        "abundance": 0.17189,
        "source": "NIST"
      },
      {
        "massNumber": 143,
        "abundance": 0.12174,
        "source": "NIST"
      },
      {
        "massNumber": 145,
        "abundance": 0.08293,
        "source": "NIST"
      },
      {
        "massNumber": 148,
        "abundance": 0.05756,
        "source": "NIST"
      },
      {
        "massNumber": 150,
        "abundance": 0.05638,
        "source": "NIST"
      }
    ],
    "61": [
      {
        "massNumber": 145,
        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 147,
        "abundance": null,
        "source": "NIST"
      }
    ],
    "62": [
      {
        "massNumber": 152,
        "abundance": 0.2675,
        "source": "NIST"
      },
      {
        "massNumber": 154,
        "abundance": 0.2275,
        "source": "NIST"
      },
      {
        "massNumber": 147,
        "abundance": 0.1499,
        "source": "NIST"
      },
      {
        "massNumber": 149,
        "abundance": 0.1382,
        "source": "NIST"
      },
      {
        "massNumber": 148,
        "abundance": 0.1124,
        "source": "NIST"
      },
      {
        "massNumber": 150,
        "abundance": 0.0738,
        "source": "NIST"
      },
      {
        "massNumber": 144,
        "abundance": 0.0307,
        "source": "NIST"
      }
    ],
    "63": [
      {
        "massNumber": 153,
        "abundance": 0.5219,
        "source": "NIST"
      },
      {
        "massNumber": 151,
        "abundance": 0.4781,
        "source": "NIST"
      }
    ],
    "64": [
      {
        "massNumber": 158,
        "abundance": 0.2484,
        "source": "NIST"
      },
      {
        "massNumber": 160,
        "abundance": 0.2186,
        "source": "NIST"
      },
      {
        "massNumber": 156,
        "abundance": 0.2047,
        "source": "NIST"
      },
      {
        "massNumber": 157,
        "abundance": 0.1565,
        "source": "NIST"
      },
      {
        "massNumber": 155,
        "abundance": 0.148,
        "source": "NIST"
      },
      {
        "massNumber": 154,
        "abundance": 0.0218,
        "source": "NIST"
      },
      {
        "massNumber": 152,
        "abundance": 0.002,
        "source": "NIST"
      }
    ],
    "65": [
      {
        "massNumber": 159,
        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "66": [
      {
        "massNumber": 164,
        "abundance": 0.2826,
        "source": "NIST"
      },
      {
        "massNumber": 162,
        "abundance": 0.25475,
        "source": "NIST"
      },
      {
        "massNumber": 163,
        "abundance": 0.24896,
        "source": "NIST"
      },
      {
        "massNumber": 161,
        "abundance": 0.18889,
        "source": "NIST"
      },
      {
        "massNumber": 160,
        "abundance": 0.02329,
        "source": "NIST"
      },
      {
        "massNumber": 158,
        "abundance": 0.00095,
        "source": "NIST"
      },
      {
        "massNumber": 156,
        "abundance": 0.00056,
        "source": "NIST"
      }
    ],
    "67": [
      {
        "massNumber": 165,
        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "68": [
      {
        "massNumber": 166,
        "abundance": 0.33503,
        "source": "NIST"
      },
      {
        "massNumber": 168,
        "abundance": 0.26978,
        "source": "NIST"
      },
      {
        "massNumber": 167,
        "abundance": 0.22869,
        "source": "NIST"
      },
      {
        "massNumber": 170,
        "abundance": 0.1491,
        "source": "NIST"
      },
      {
        "massNumber": 164,
        "abundance": 0.01601,
        "source": "NIST"
      },
      {
        "massNumber": 162,
        "abundance": 0.00139,
        "source": "NIST"
      }
    ],
    "69": [
      {
        "massNumber": 169,
        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "70": [
      {
        "massNumber": 174,
        "abundance": 0.32026,
        "source": "NIST"
      },
      {
        "massNumber": 172,
        "abundance": 0.2168,
        "source": "NIST"
      },
      {
        "massNumber": 173,
        "abundance": 0.16103,
        "source": "NIST"
      },
      {
        "massNumber": 171,
        "abundance": 0.1409,
        "source": "NIST"
      },
      {
        "massNumber": 176,
        "abundance": 0.12996,
        "source": "NIST"
      },
      {
        "massNumber": 170,
        "abundance": 0.02982,
        "source": "NIST"
      },
      {
        "massNumber": 168,
        "abundance": 0.00123,
        "source": "NIST"
      }
    ],
    "71": [
      {
        "massNumber": 175,
        "abundance": 0.97401,
        "source": "NIST"
      },
      {
        "massNumber": 176,
        "abundance": 0.02599,
        "source": "NIST"
      }
    ],
    "72": [
      {
        "massNumber": 180,
        "abundance": 0.3508,
        "source": "NIST"
      },
      {
        "massNumber": 178,
        "abundance": 0.2728,
        "source": "NIST"
      },
      {
        "massNumber": 177,
        "abundance": 0.186,
        "source": "NIST"
      },
      {
        "massNumber": 179,
        "abundance": 0.1362,
        "source": "NIST"
      },
      {
        "massNumber": 176,
        "abundance": 0.0526,
        "source": "NIST"
      },
      {
        "massNumber": 174,
        "abundance": 0.0016,
        "source": "NIST"
      }
    ],
    "73": [
      {
        "massNumber": 181,
        "abundance": 0.9998799,
        "source": "NIST"
      },
      {
        "massNumber": 180,
        "abundance": 0.0001201,
        "source": "NIST",
        "note": "The natural trace abundance refers to metastable tantalum-180m. Tantalum-180 also has a ground state; both have 73 protons and 107 neutrons.",
        "noteSource": "https://ciaaw.org/tantalum.htm"
      }
    ],
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        "abundance": 0.3064,
        "source": "NIST"
      },
      {
        "massNumber": 186,
        "abundance": 0.2843,
        "source": "NIST"
      },
      {
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        "abundance": 0.265,
        "source": "NIST"
      },
      {
        "massNumber": 183,
        "abundance": 0.1431,
        "source": "NIST"
      },
      {
        "massNumber": 180,
        "abundance": 0.0012,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": 0.626,
        "source": "NIST"
      },
      {
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        "abundance": 0.374,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": 0.4078,
        "source": "NIST"
      },
      {
        "massNumber": 190,
        "abundance": 0.2626,
        "source": "NIST"
      },
      {
        "massNumber": 189,
        "abundance": 0.1615,
        "source": "NIST"
      },
      {
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        "abundance": 0.1324,
        "source": "NIST"
      },
      {
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        "abundance": 0.0196,
        "source": "NIST"
      },
      {
        "massNumber": 186,
        "abundance": 0.0159,
        "source": "NIST"
      },
      {
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        "abundance": 0.0002,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": 0.627,
        "source": "NIST"
      },
      {
        "massNumber": 191,
        "abundance": 0.373,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": 0.3378,
        "source": "NIST"
      },
      {
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        "abundance": 0.3286,
        "source": "NIST"
      },
      {
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        "abundance": 0.2521,
        "source": "NIST"
      },
      {
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        "abundance": 0.07356,
        "source": "NIST"
      },
      {
        "massNumber": 192,
        "abundance": 0.00782,
        "source": "NIST"
      },
      {
        "massNumber": 190,
        "abundance": 0.00012,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": 1.0,
        "source": "NIST"
      }
    ],
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        "abundance": 0.2986,
        "source": "NIST"
      },
      {
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        "abundance": 0.231,
        "source": "NIST"
      },
      {
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        "source": "NIST"
      },
      {
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        "abundance": 0.1318,
        "source": "NIST"
      },
      {
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        "abundance": 0.0997,
        "source": "NIST"
      },
      {
        "massNumber": 204,
        "abundance": 0.0687,
        "source": "NIST"
      },
      {
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        "abundance": 0.0015,
        "source": "NIST"
      }
    ],
    "81": [
      {
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        "abundance": 0.7048,
        "source": "NIST"
      },
      {
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        "abundance": 0.2952,
        "source": "NIST"
      }
    ],
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      {
        "massNumber": 208,
        "abundance": 0.524,
        "source": "NIST"
      },
      {
        "massNumber": 206,
        "abundance": 0.241,
        "source": "NIST"
      },
      {
        "massNumber": 207,
        "abundance": 0.221,
        "source": "NIST"
      },
      {
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        "abundance": 0.014,
        "source": "NIST"
      }
    ],
    "83": [
      {
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        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "84": [
      {
        "massNumber": 209,
        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "85": [
      {
        "massNumber": 210,
        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 211,
        "abundance": null,
        "source": "NIST"
      }
    ],
    "86": [
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 220,
        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
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      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "88": [
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 224,
        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 226,
        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "89": [
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        "source": "NIST"
      }
    ],
    "90": [
      {
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        "abundance": 1.0,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "91": [
      {
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        "abundance": 1.0,
        "source": "NIST"
      }
    ],
    "92": [
      {
        "massNumber": 238,
        "abundance": 0.992742,
        "source": "NIST"
      },
      {
        "massNumber": 235,
        "abundance": 0.007204,
        "source": "NIST"
      },
      {
        "massNumber": 234,
        "abundance": 5.4e-05,
        "source": "NIST"
      },
      {
        "massNumber": 233,
        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 236,
        "abundance": null,
        "source": "NIST"
      }
    ],
    "93": [
      {
        "massNumber": 236,
        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 237,
        "abundance": null,
        "source": "NIST"
      }
    ],
    "94": [
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "95": [
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "96": [
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "97": [
      {
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        "abundance": null,
        "source": "NIST"
      },
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "98": [
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        "abundance": null,
        "source": "NIST"
      },
      {
        "massNumber": 250,
        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "99": [
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "100": [
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "101": [
      {
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        "abundance": null,
        "source": "NIST"
      },
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "102": [
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "103": [
      {
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        "abundance": null,
        "source": "NIST"
      }
    ],
    "104": [
      {
        "massNumber": 267,
        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "105": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "106": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "107": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "108": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "109": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
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      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "111": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "112": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "113": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "114": [
      {
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        "source": "IUPAC 2022"
      }
    ],
    "115": [
      {
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        "source": "IUPAC 2022"
      }
    ],
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      {
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        "source": "IUPAC 2022"
      }
    ],
    "117": [
      {
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        "abundance": null,
        "source": "IUPAC 2022"
      }
    ],
    "118": [
      {
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        "source": "IUPAC 2022"
      }
    ]
  }
}