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For example, FeSO 4 is named iron(2+) sulfate (with the 2+ charge on the Fe2+ ions balancing the 2â charge on the sulfate ion), whereas Fe 2 (SO 4) 3 is named iron(3+) sulfate (because the two iron ions in each formula unit each have a charge of 3+, to balance the 2â on each of the three sulfate ions).
Quick Answer. The overall or net charge of any ionic compound must equal zero. Although ions themselves are either positive (cation) or negative (anion) by definition, the only way they can bond together and form a compound is by seeking an opposite charge.