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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).
This chemical compound is composed of one tin ion, which is ionically bound to two NO3, or nitrate ions. The tin (II) ion has a 2- charge. Nitrate is a polyatomic ion with a 1- charge. Nitrate has a trigonal planar geometry, with a central nitrogen atom and three surrounding oxygens. The nitrogen atom carries a 1+ charge, while the three oxygens carry a 2/3- charge. Nitrate carries an overall 1- charge.