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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.
Ionic compounds are basically defined in such a way that compounds containing two or more ions are considered alongside electrical attraction. One of the positively charged ions (called cations) and the second is a negative charge (anion).Cations are usually the metal atoms and anions are polyatomic ions or metals (ions with more than one atom).ne of the positively charged ions (called cations) and the second is a negative charge (anion). Cations are usually the metal atoms and anions are polyatomic ions or metals (ions with more than one atom).