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According to the recommendations of the IUPAC Commission on Physical Organic Chemistry ["Names for Hydrogen Atoms, Ions, and Groups, and for Reactions Involving Them", Pure Appl. Chem., 60, 1115-1116 (1988)], the word "proton" should be restricted to the cation

, the cation

in its natural isotopic abundance being named "hydron".

This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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