Meaning onium ion
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onium ion(1) A cation (with its counterion) derived by addition of a hydron to a mononuclear parent hydride of the nitrogen, chalcogen and halogen family, e.g. H4N+ ammonium ion. (2) Derivatives formed by substitution of the above parent ions by univalent groups, e.g. (CH3)2S+H dimethylsulfonium, (CH3CH2)4N+ tetraethylammonium. (3) Derivatives formed by sub [..]
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