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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 20056
    chemical entity 20055
      atom 20054
        s-block element atom 19752
          helium atom 0
            helium-3 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 20056
    subatomic particle 20054
      composite particle 20054
        hadron 20054
          baryon 20054
            nucleon 20054
              atomic nucleus 20054
                atom 20054
                  main group element atom 19956
                    main group molecular entity 19956
                      gas molecular entity 18230
                        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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