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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 400
    chemical entity 400
      atom 400
        s-block element atom 338
          helium atom 0
            helium-3 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 400
    subatomic particle 400
      composite particle 400
        hadron 400
          baryon 400
            nucleon 400
              atomic nucleus 400
                atom 400
                  main group element atom 393
                    main group molecular entity 393
                      gas molecular entity 241
                        noble gas atom 0
                          noble gas molecular entity 0
                            helium molecular entity 0
                              elemental helium 0
                                monoatomic helium 0
                                  helium(2+) 0
                                    helion 0
                                      helium-3 atom 0
paths to the root