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Oxidation state
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== Use in nomenclature == The oxidation state in compound naming for [[transition metal]]s and [[lanthanides]] and [[actinides]] is placed either as a right superscript to the element symbol in a chemical formula, such as Fe<sup>III</sup> or in parentheses after the name of the element in chemical names, such as iron(III). For example, {{chem|Fe|2|(SO|4|)|3}} is named [[iron(III) sulfate]] and its formula can be shown as Fe{{su|p=III|b=2}}{{chem|(SO|4|)|3}}. This is because a [[sulfate ion]] has a charge of β2, so each iron atom takes a charge of +3.
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