High Quality Content by WIKIPEDIA articles! Onium compounds are cations derived by the protonation of mononuclear parent hydrides of elements of the nitrogen family (Group 15), chalcogen family (Group 16), and halogen family (Group 17), and similar cations derived by the substitution of hydrogen atoms in the former by other groups, such as organic radicals, or halogens, for example tetramethylammonium, and further derivatives having polyvalent additions, such as iminium and nitrilium. They are also known as onium ions. Compounds of these ions are known as onium salts. Onium ions have a charge of +1; double onium ions have a charge of +2, and so on.

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