1. Naming Compounds With Transition Metals

2. Naming Transition Metals The Stock System Transition Metals have variable oxidation numbers so we have to tell what charge the ion has in our compound #1 – Name the metal. #2 – Add a roman numeral telling the charge on the metal in parentheses. #3 – Name the negative ion as before.

3. Roman Numerals 1I 2II 3III 4IV 5V 6VI 7VII 8VIII 9IX 10X

4. Examples: CrO Since we know that O is a - 2 charge, Cr must be a +2 to balance it out. Chromium (II) oxide FeCl 3 Since we know that Cl is a - 1 charge, Fe must be a +3 to balance it out. Iron (III) chloride

5. Writing Formulas with Transition Metals Because transition metals are variable the charge of the metal is represented with a roman numeral. Copper (I) has a charge of +1 Copper (II) has a charge of +2

6. Examples Copper (I) and chlorine CuCl +1 CuCl Copper (II) and chlorine CuCl 2 Nickel (III) perchlorate Ni(ClO 4 ) 3

7. Group I and II metals (Main group) and Al do not use the stock system.