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An oxyanion, or oxoanion, is an ion with the generic formula A x O z− y (where A represents a chemical element and O represents an oxygen atom). Oxyanions are formed by a large majority of the chemical elements. [1] The formulae of simple oxyanions are determined by the octet rule. The corresponding oxyacid of an oxyanion is the compound H z ...
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This page was last edited on 3 November 2023, at 15:03 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The dithionite is the oxyanion with the formula [S 2 O 4] 2−. [1] It is commonly encountered as the salt sodium dithionite. For historical reasons, it is sometimes called hydrosulfite, but it contains no hydrogen and is not a sulfite. [2] The dianion has a steric number of 4 and trigonal pyramidal geometry.
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An unusually stable oxonium species is the gold complex tris[triphenylphosphinegold(I)]oxonium tetrafluoroborate, [(Ph 3 PAu) 3 O][BF 4], where the intramolecular aurophilic interactions between the gold atoms are believed responsible for the stabilisation of the cation.
Dissolution of oxides often gives oxyanions. Adding aqueous base to P 4 O 10 gives various phosphates. Adding aqueous base to MoO 3 gives polyoxometalates. Oxycations are rarer, some examples being nitrosonium (NO +), vanadyl (VO 2+), and uranyl (UO 2+ 2). Of course many compounds are known with both oxides and other groups.