1. Ternary Ionic Compounds polyatomic ions- ions made up of two or more atoms that carry a charge *found on sheet ex- sulfate SO 4 2- hydroxide OH 1- nitrite NO 2 1-

2. -most polyatomic ions are anions -only positive on sheet is: ammonium NH 4 1+ Ternary Ionic Compounds -compounds that contain ions of usually three different elements with a polyatomic ion

3. Rules for naming ternary ionic compounds 1)write the formula (symbol and charge) for each ion ex- calcium + nitrate Ca 2+ NO 3 1- 2)criss cross charges Ca 1 NO 32

4. 3)you may need parentheses around polyatomic ion if a subscript greater than 1 goes there Ca 1 (NO 3 ) 2 4)lowest whole number ratios Ca(NO 3 ) 2 5)name cation then polyatomic anion calcium nitrate

5. Examples: 1)potassium + sulfate K 1+ SO 4 2- K 2 SO 4 potassium sulfate

6. 2)tin (IV) + sulfite Sn 4+ SO 3 2- Sn 2 (SO 3 ) 4 Sn(SO 3 ) 2 tin (IV) sulfite