{
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    {
      "@value": "Argon-40",
      "@language": "en",
      "@lang": "en",
      "provenance": {
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        "prov:wasAttributedTo": "consensus-flow-list",
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        "prov:wasDerivedFrom": "prefLabel"
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  "altLabel": [],
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      "parent_element_flow_object_id": "fo-9cd8e614ca2929e5",
      "relationship_type": "isotope_of"
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      "nuclide": "40Ar",
      "mass_number": 40,
      "atomic_mass_and_uncertainty_u": "39.96238312204 ± 0.00000000234",
      "half_life_and_uncertainty": "Stable",
      "decay_modes": "IS=99.6035±25%",
      "discovery_year": "1920",
      "specific_activity_bq_per_g": "",
      "specific_activity_bq_per_g_value": null,
      "half_life_chemlin": "stable",
      "chemlin_url": "https://www.chemlin.org/isotope/argon-40",
      "metastable_resolution": {
        "strategy": "longest_half_life",
        "selected_slug": "argon-40",
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        "alternates": [],
        "attempted_urls": [
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        ]
      },
      "symbol": "Ar",
      "metastable": false
    },
    "isotope_lookup": {
      "is_kbq_candidate": true,
      "matched": true,
      "matched_on": "Argon-40",
      "source": "pubchem_pug_view_annotation_heading",
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  "references": [
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    "https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/element/18/JSON",
    "https://www.chemlin.org",
    "https://www.chemlin.org/isotope/argon-40"
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  "created_from": {
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    "seed_uuid": "3f5f02ed-d820-47b1-b319-505ab06b9bc0",
    "seed_source": "EF 3.1"
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  "classifications": {},
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}