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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:xenon-129 atom
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Accession:CHEBI:52453 term browser browse the term
Definition:The stable isotope of xenon with relative atomic mass 128.904780, 26.4 atom percent natural abundance and nuclear spin 1/2.
Synonyms:related_synonym: (129)54Xe;   (129)Xe;   Formula=[129Xe];   InChI=1S/Xe/i1-2;   InChIKey=FHNFHKCVQCLJFQ-YPZZEJLDSA-N;   SMILES=[129Xe];   xenon-129

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19841
    chemical entity 19841
      atom 19839
        nonmetal atom 19720
          noble gas atom 24
            xenon atom 6
              xenon-129 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19841
    subatomic particle 19839
      composite particle 19839
        hadron 19839
          baryon 19839
            nucleon 19839
              atomic nucleus 19839
                atom 19839
                  main group element atom 19732
                    main group molecular entity 19732
                      gas molecular entity 17612
                        noble gas atom 24
                          xenon atom 6
                            xenon molecular entity 6
                              elemental xenon 6
                                monoatomic xenon 6
                                  xenon(0) 6
                                    xenon-129 atom 0
paths to the root