1. Polyatomic Ions  Polyatomic ions are ions made up of more than one atom  There are 15 polyatomic ions (ions made up of more than one atom)  I will give you the chart on page 178 of the text for the test, so when you see the formula, you need to be able to tell me the name.

2.  Here are some of them….  OH- hydroxide  SO 4 2- sulfate  SO 3 2- sulfite  O 2 2- peroxide  NO 2 - nitrite  NO 3 - nitrate  MnO 4 - permanganate

3. The same rules apply when dealing with polyatomic ions. (remember, the charge associated with the polyatomic ion applies to the entire ion) K + + CN - → KCN 2Na + + O 2 2- → Na 2 O 2 Mg 2+ + 2NO 2 - → Mg(NO 2 ) 2 (by putting parenthesis around the Nitrite portion of the compound, the following subscript tells us that there are 2 nitrite ions for every one Magnesium ion in this compound)

4. More Practice: Li + + MnO 4 - → Ca 2+ + NO 2 - → Na + + SO 3 2- →

5. More Practice: Li + + MnO 4 - → LiMnO 4 Ca 2+ + 2NO 2 - → 2Na + + SO 3 2- → ite

6. More Practice: Li + + MnO 4 - → LiMnO 4 Lithium Permanganate Ca 2+ + 2NO 2 - → 2Na + + SO 3 2- →

7. More Practice: Li + + MnO 4 - → LiMnO 4 Lithium Permanganate Ca 2+ + 2NO 2 - → Ca(NO 2 ) 2 2Na + + SO 3 2- →

8. More Practice: Li + + MnO 4 - → LiMnO 4 Lithium Permanganate Ca 2+ + 2NO 2 - → Ca(NO 2 ) 2 Calcium Nitrite 2Na + + SO 3 2- →

9. More Practice: Li + + MnO 4 - → LiMnO 4 Lithium Permanganate Ca 2+ + 2NO 2 - → Ca(NO 2 ) 2 Calcium Nitrite 2Na + + SO 3 2- → Na 2 SO 3

10. More Practice: Li + + MnO 4 - → LiMnO 4 Lithium Permanganate Ca 2+ + 2NO 2 - → Ca(NO 2 ) 2 Calcium Nitrite 2Na + + SO 3 2- → Na 2 SO 3 Sodium Sulfite

11. Naming Compounds that have TRANSITION METALS  because transition metals can have more than one charge, you must include the charge of the metal, in the form of a Roman Numeral, in the name. For example… Fe 2+ + 2OH -  Fe(OH) 2 The product is named Iron (II) Hydroxide Fe 3+ + 3OH -  Fe(OH) 3 This product would be named Iron (III) Hydroxide