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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 499
    chemical entity 499
      atom 499
        nonmetal atom 492
          silicon atom 0
            silicon-31 atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 499
    subatomic particle 499
      composite particle 499
        hadron 499
          baryon 499
            nucleon 499
              atomic nucleus 499
                atom 499
                  main group element atom 492
                    p-block element atom 492
                      carbon group element atom 481
                        silicon atom 0
                          silicon-31 atom 0
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