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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).
Rating Newest Oldest. Best Answer: Phosphorus in a compound usually doesn't have a charge, as in an ionic charge, because phosphorous only forms covalent bonds in compounds. If you dissolve Na3P in water it will dissociate to form sodium ions and phosphide ions. In that case phosphorous will have a charge of -3.