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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).
Ionic compounds always contain a metal and a non-metal. A compound is always neutral, and so charges of the ions in the compound must balance out. We always know the charges on the ions from the periodic table. So the next stage is to determine the correct ratio of ions that will produce charge neutrality.