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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-8 atom
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Accession:CHEBI:37004 term browser browse the term
Definition:The radioactive isotope of helium with relative atomic mass 8.03392 and half-life of 119.0 ms.
Synonyms:related_synonym: (8)2He;   (8)He;   Formula=[8He];   InChI=1S/He/i1+4;   InChIKey=SWQJXJOGLNCZEY-RNFDNDRNSA-N;   SMILES=[8He];   helium-8

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19921
    chemical entity 19919
      atom 19919
        s-block element atom 19697
          helium atom 0
            helium-8 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19921
    subatomic particle 19919
      composite particle 19919
        hadron 19919
          baryon 19919
            nucleon 19919
              atomic nucleus 19919
                atom 19919
                  main group element atom 19867
                    main group molecular entity 19867
                      gas molecular entity 18479
                        noble gas atom 46
                          helium atom 0
                            helium-8 atom 0
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