1. Naming and Writing Polyatomic Ionic Compounds 12/4/13

2. Reference Material  Poly means many  Polyatomic ions are a group of atoms that have a charge when they are together  Most have a negative charge

3. Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Sodium carbonate

4. Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Magnesium nitrate

5. Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Barium sulfate

6. Write the formula for the following polyatomic ionic compounds:  Ammonium Sulfide  Potassium Carbonate  Aluminum Phosphate

7. Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: KCN _______________________________

8. Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: Ca(OH) 2 ____________________________

9. Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: NH 4 F _______________________________

10. Naming Polyatomic Ionic Compounds  KOH ______________________________________  CaSO 4 ____________________________________  BaCO 3 _____________________________________  Al 2 (SO 4 ) 3 ________________________________