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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:silicon-31 atom
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Accession:CHEBI:37977 term browser browse the term
Definition:The radioactive isotope of silicon with relative atomic mass 30.975363, half-life of 2.62 hours and nuclear spin (3)/2.
Synonyms:related_synonym: (31)14Si;   (31)Si;   Formula=[31Si];   InChI=1S/Si/i1+3;   InChIKey=XUIMIQQOPSSXEZ-AKLPVKDBSA-N;   SMILES=[31Si];   silicon, isotope of mass 31;   silicon-31
 xref: CAS:14276-49-4

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Path 1
Term Annotations click to browse term
  CHEBI ontology 25983
    chemical entity 25975
      atom 25971
        nonmetal atom 25443
          silicon atom 6208
            silicon-31 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 25983
    subatomic particle 25958
      composite particle 25958
        hadron 25958
          baryon 25958
            nucleon 25958
              atomic nucleus 25971
                atom 25971
                  main group element atom 25780
                    p-block element atom 25780
                      carbon group element atom 25376
                        silicon atom 6208
                          silicon-31 atom 0
paths to the root