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The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at The data is made available under the Creative Commons License (CC BY 3.0, For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.

Term:helium-3 atom
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Accession:CHEBI:30218 term browser browse the term
Definition:The stable isotope of helium with relative atomic mass 3.016029. The least abundant (0.000137 atom percent) isotope of naturally occurring helium.
Synonyms:related_synonym: (3)2He;   (3)He;   (3He)helium;   Formula=[3He];   InChI=1S/He/i1-1;   InChIKey=SWQJXJOGLNCZEY-BJUDXGSMSA-N;   SMILES=[3He];   helium, isotope of mass 3;   helium-3
 xref: CAS:14762-55-1;   Gmelin:14208

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19818
    chemical entity 19816
      atom 19816
        s-block element atom 19612
          helium atom 0
            helium-3 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19818
    subatomic particle 19816
      composite particle 19816
        hadron 19816
          baryon 19816
            nucleon 19816
              atomic nucleus 19816
                atom 19816
                  main group element atom 19761
                    main group molecular entity 19761
                      gas molecular entity 18371
                        noble gas atom 46
                          noble gas molecular entity 6
                            helium molecular entity 0
                              elemental helium 0
                                monoatomic helium 0
                                  helium(2+) 0
                                    helion 0
                                      helium-3 atom 0
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