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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:tritium atom
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Accession:CHEBI:29238 term browser browse the term
Definition:The radioactive isotope of hydrogen with relative atomic mass 3.016049 and half-life of 12.33 years (from Greek taurhoiotatauomicronsigma, third).
Synonyms:related_synonym: (3)1H;   (3)H;   Formula=T;   InChI=1S/H2/h1H/i1+2;   InChIKey=UFHFLCQGNIYNRP-NJFSPNSNSA-N;   SMILES=[3H];   T;   hydrogen-3;   tritio;   tritium;   ueberschwerer Wasserstoff

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19908
    chemical entity 19906
      molecular entity 19906
        inorganic molecular entity 19697
          hydrogen atom 19673
            tritium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19908
    subatomic particle 19906
      composite particle 19906
        hadron 19906
          baryon 19906
            nucleon 19906
              atomic nucleus 19906
                atom 19906
                  main group element atom 19853
                    main group molecular entity 19853
                      s-block molecular entity 19684
                        hydrogen molecular entity 19673
                          elemental hydrogen 17
                            monoatomic hydrogen 0
                              hydron 0
                                triton 0
                                  tritium atom 0
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