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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).
Determine the expected charge of the non-metal using the a similar procedure. Elements in column 17 (F, Cl, Br, I) have a -1 charge in ionic compounds, elements in column 16 (O, S, Se, Te) have a -2 charge, and elements in column 15 (N, P, As, Sb) often have a -3 charge in ionic compounds.The total positive charge of the metal must equal the total negative charge of the non-metal.lements in column 17 (F, Cl, Br, I) have a -1 charge in ionic compounds, elements in column 16 (O, S, Se, Te) have a -2 charge, and elements in column 15 (N, P, As, Sb) often have a -3 charge in ionic compounds.