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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 19823
    chemical entity 19823
      molecular entity 19821
        inorganic molecular entity 19520
          hydrogen atom 19495
            tritium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19823
    subatomic particle 19821
      composite particle 19821
        hadron 19821
          baryon 19821
            nucleon 19821
              atomic nucleus 19821
                atom 19821
                  main group element atom 19720
                    main group molecular entity 19720
                      s-block molecular entity 19502
                        hydrogen molecular entity 19495
                          elemental hydrogen 17
                            monoatomic hydrogen 0
                              hydron 0
                                triton 0
                                  tritium atom 0
paths to the root