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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 25538
    chemical entity 25513
      molecular entity 25491
        inorganic molecular entity 24818
          hydrogen atom 24231
            protium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 25538
    subatomic particle 25509
      composite particle 25509
        hadron 25509
          baryon 25509
            nucleon 25509
              atomic nucleus 25509
                atom 25509
                  main group element atom 25358
                    main group molecular entity 25358
                      s-block molecular entity 24669
                        hydrogen molecular entity 24231
                          elemental hydrogen 16
                            monoatomic hydrogen 0
                              hydron 0
                                proton 0
                                  protium atom 0
paths to the root