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Noun. 1. cation-a positively charged ion. hydrogen ion-a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus. ion-a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons.
Name the cation. 1  Metals that form only one cation. 2  As noted in Section 2.1 Chemical Compounds , these metals are usually in groups 1â3, 12, and 13. 3  The name of the cation of a metal that forms only one cation is the same as the name of the metal (with the word ion added if the cation is by itself).