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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:protium atom
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Accession:CHEBI:29236 term browser browse the term
Definition:The stable isotope of hydrogen with relative atomic mass 1.007825 and a natural abundance of 99.9885 atom percent (from Greek pirhoomegatauomicronsigma, first).
Synonyms:related_synonym: (1)1H;   (1)H;   Formula=[1H];   InChI=1S/H/i1+0;   InChIKey=YZCKVEUIGOORGS-IGMARMGPSA-N;   SMILES=[1H];   hydrogen-1;   protio;   protium

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 21873
    chemical entity 21871
      molecular entity 21862
        inorganic molecular entity 21572
          hydrogen atom 21282
            protium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 21873
    subatomic particle 21863
      composite particle 21863
        hadron 21863
          baryon 21863
            nucleon 21863
              atomic nucleus 21863
                atom 21863
                  main group element atom 21785
                    main group molecular entity 21785
                      s-block molecular entity 21342
                        hydrogen molecular entity 21282
                          elemental hydrogen 17
                            monoatomic hydrogen 0
                              hydron 0
                                proton 0
                                  protium atom 0
paths to the root