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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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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 22094
    chemical entity 22126
      atom 22119
        nonmetal atom 21984
          silicon atom 5994
            silicon-31 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 22094
    subatomic particle 22086
      composite particle 22086
        hadron 22086
          baryon 22086
            nucleon 22086
              atomic nucleus 22119
                atom 22119
                  main group element atom 22018
                    p-block element atom 22018
                      carbon group element atom 21831
                        silicon atom 5994
                          silicon-31 atom 0
paths to the root