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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).
To determine common ionic compounds formed by elements, keep the following in mind: 1  Group I ions (alkali metals) have +1 charges. 2  Group 2 ions (alkaline earth metals) have +2 charges. 3  Group 6 ions (nonmetals) have -2 charges. 4  Group 7 ions (halides) have -1 charges. 5  There is no simple way to predict the charges of the transition metals.