1. What is the Roman Numeral? Naming Compounds with Transition Metals + Sn & Pb

2. How do I figure out charge on cation? When naming ionic compounds with a transition metal or Sn & Pb, you must include a roman numeral in the name to indicate the positive charge on the cation. Examples: CuCl 2 = Copper (II) chloride Co(NO 3 ) 3 = Cobalt (III) nitrate

3. How do I figure out charge on cation? From the finished formula, you must work backwards to determine the positive charge. You also must know the negative charge on anion. Example: AuCl 3

4. Practice Problems: 1. Cr 2 O 3 2. Sn(C 2 H 3 O 2 ) 2 3. Cu 3 PO 4