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Find out the charge of the metal. Name the metal and add a Roman numeral as needed. Name the non-metal by revising the suffix. Combine the names to generate the ionic compound name. Don’t use Roman numerals when naming compounds with zinc or silver.
If your metal comes from group 3 (or higher) in the periodic table, you’ll need to figure out its charge. The subscript numeral of the anion that the metal is paired with indicates the charge of a transition metal. Metals will have a positive charge, so in this case, you’ll cross over the 3 from the O3 and write that Fe has a charge of +3.  You can also do the reverse and write that O has a charge of -2. In many high-school- or college-level chemistry assignments, the metal’s charge will be provided for you. Consult the periodic table if you need to find out the chemical code for the metal you’re dealing with. Since Fe is iron and it has a charge of +3, you can write down Iron (III). Remember to only use the Roman numeral when you're writing out the ionic compound’s name and not when writing the formula. Refer to the periodic table if you forget the anion name. Since O is oxygen, you can drop the “–gen” ending and add the "-ide" ending. Call it "oxide." Anions always take the –ide suffix. So, you’ll name anions the same regardless of what type of metal they’re paired with in an ionic compound. This part is no different from writing out the name of an ionic compound that doesn’t have a transition metal. Combine the metal and non-metal names (Roman numeral included) to name the ionic compound: Fe2O3 = Iron (III) oxide. The 2 transition metals that do have a definite charge are zinc (Zn) and silver (Ag). So, the charge of the metal in ionic compounds with zinc or silver doesn’t need to be borrowed from the subscript of the anion. Zinc always has a charge of +2 and silver always has a charge of +1.This means that you don't have to use Roman numerals or the older naming method in describing those elements.