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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.
Nonmetal elements, like nitrogen, oxygen, and hydrogen, are capable of forming cations as well. Hydrogen occurs quite frequently as a +1 cation, while nitrogen and oxygen can form cations when they are in compound form. The ammonium ion is a type of cation formed when nitrogen is bonded to four hydrogens.