Send us a Message

Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   


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
go back to main search page
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

show annotations for term's descendants           Sort by:

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