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a.1.(Chem.) Same as Pentavalent.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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This metal occurs in two oxidation states: the trivalent form, arsenic trioxide or arsenite ([As.sub.2][O.sub.3]), and the quinquivalent form, arsenate ([As.sub.2][O.sub.5]), with the former state being 60 times more toxic than the latter [2].