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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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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 21845
    chemical entity 21843
      atom 21831
        s-block element atom 21315
          helium atom 0
            helium-3 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 21845
    subatomic particle 21831
      composite particle 21831
        hadron 21831
          baryon 21831
            nucleon 21831
              atomic nucleus 21831
                atom 21831
                  main group element atom 21754
                    main group molecular entity 21754
                      gas molecular entity 19393
                        noble gas atom 52
                          noble gas molecular entity 6
                            helium molecular entity 0
                              elemental helium 0
                                monoatomic helium 0
                                  helium(2+) 0
                                    helion 0
                                      helium-3 atom 0
paths to the root