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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.

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Accession:CHEBI:39099 term browser browse the term
Definition:A calcium cation that has formula Ca.
Synonyms:exact_synonym: calcium(I) cation
 related_synonym: Ca;   Formula=Ca;   InChI=1S/Ca/q+1;   InChIKey=JDMNMMCDWTVNSP-UHFFFAOYSA-N;   SMILES=[Ca+];   calcium cation;   calcium ion (1+);   calcium monocation
 xref: CAS:14102-48-8;   Gmelin:75319

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19812
    chemical entity 19812
      molecular entity 19811
        ion 16058
          monoatomic ion 15176
            monoatomic cation 14012
              monoatomic monocation 10557
                calcium(1+) 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19812
    subatomic particle 19811
      composite particle 19811
        hadron 19811
          baryon 19811
            nucleon 19811
              atomic nucleus 19811
                atom 19811
                  main group element atom 19708
                    main group molecular entity 19708
                      s-block molecular entity 19493
                        alkaline earth molecular entity 673
                          calcium molecular entity 539
                            elemental calcium 535
                              calcium ion 90
                                calcium cation 89
                                  calcium(1+) 0
paths to the root