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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).
But there are also complex ions such as NH4+ and SO42- which form ionic bonds despite containing non metals. So best way is to remember the valency or charge of each simple or complex ion. A compound consisting of a cation(+ ve charge) and an anion(-ve charge) will be instantly recognized as ionic.Bittu Â· 3 years ago.ut there are also complex ions such as NH4+ and SO42- which form ionic bonds despite containing non metals. So best way is to remember the valency or charge of each simple or complex ion. A compound consisting of a cation(+ ve charge) and an anion(-ve charge) will be instantly recognized as ionic. Bittu Â· 3 years ago.