oxonomen - Nomenclature of Oxyacids and Oxyanions There...

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oxonomen.wpd 1/30/02 Nomenclature of Oxyacids and Oxyanions There exists a class of ternary compounds (compounds which contain three elements) called oxyacids. These compounds contain hydrogen, oxygen and a third element which is a nonmetal. In these materials the oxygens are bonded directly to the nonmetal atom with hydrogens attached to the oxygens. For any given nonmetal atom there may be up to four oxyacids that exist. For example, there are four different oxyacids for the element chlorine; HClO, HClO 2 , HClO 3 , and HClO 4 . If these acids are stripped of their protons by reaction with base four oxyanions are produced; ClO -1 , ClO 2 -1 , ClO 3 -1 , and ClO 4 -1 . Each nonmetal element is assigned a reference oxidation state. The systematic names given to oxyacids and oxyanions are based on the oxidation state of the nonmetal atom in each species relative to the reference oxidation state. For all nonmetal elements this reference oxidation state is equal to the group number except those nonmetal elements in group VIIA where the reference is (+5). That is, the reference oxidation states are: GRP III A GRP IV A GRP V A GRP VI A GRP VII A BCNOF Si P S Cl As Se Br Te I Ref Ox St = +3 Ref Ox St = +4 Ref Ox St = +5 Ref Ox St = +6 Ref Ox St = +5
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oxonomen - Nomenclature of Oxyacids and Oxyanions There...

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