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There are 4 letters in ONIU ( I1N1O1U1 )
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Definitions of oniu in various dictionaries:
ONIU - In chemistry, an onium ion is a cation formally obtained by the protonation of mononuclear parent hydride of a pnictogen (group 15 of the periodic ta...
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In chemistry, an onium ion is a cation formally obtained by the protonation of mononuclear parent hydride of a pnictogen (group 15 of the periodic table), chalcogen (group 16), or halogen (group 17). The oldest-known onium ion, and the namesake for the class, is ammonium, NH+4, the protonated derivative of ammonia, NH3.The name onium is also used for cations that would result from the substitution of hydrogen atoms in those ions by other groups, such as organic radicals, or halogens; such as tetraphenylphosphonium, (C6H5)4P+. The substituent groups may be divalent or trivalent, yielding ions such as iminium and nitrilium.A simple onium ion has a charge of +1. A larger ion that has two onium ion subgroups is called a double onium ion, and has a charge of +2. A triple onium ion has a charge of +3, and so on. * Compounds of an onium cation and some other negative ion are known as onium compounds or onium salts. * Onium ions and onium compounds are inversely analogous to -ate ions and ate complexes:* Lewis bases form onium ions when the central atom gains one more bond and becomes a positive cation. * Lewis acids form -ate ions when the central atom gains one more bond and becomes a negative anion. |