2. Naming Binary Ionic Compounds “Binary” just means that the compound has two elements in the formula. To name any binary ionic compound, place the cation first, followed by the anion name. Use the correct chemical name of the cation Replace the ending of the anion with -ide The name of Cs 2 O, is cesium oxide.

3. More on Ionic Compounds Dealing with the Transition Metals (includes Pb and Sn too) Transition metals can have more than one charge. For example there can be Fe +2 and Fe +3. For this reason we must tell people the charge on the transition metal- use a roman numeral in parentheses. Ex. Iron (II) or Iron (III) Roman Numerals: I = 1, II = 2, III = 3, IV = 4, V = 5, VI = 6, VII = 7

4. More on Ionic Compounds Exceptions: There are some transition metals that only have one charge. These transition metals do NOT use a roman numeral. They are silver (Ag +1 ), cadmium (Cd +2 ), and zinc (Zn +2 ). Example: Ag 2 S Silver sulfide NOT Silver (I) sulfide because silver is ALWAYS +1 and there is no need to specify its charge.

5. Naming Ternary Ionic Compounds (3+ Elements) Naming Compounds containing Polyatomic Ions (a group of atoms with a charge) l. Name the metal ion 2.Name the polyatomic ion Example: KNO 3 potassium nitrate

6. Naming Ternary Ionic Compounds (3+ Elements) Or… l. Name the polyatomic ion 2. Name the nonmetal ion, changing the ending to “ide” Example: NH 4 Cl ammonium chloride