1. Chemical Bonding Ionic Bonds & Ionic Compounds

3. Compounds composed of cations and anions

4. Usually composed of metal cations and nonmetal anions

6. Chemical formula Notation showing the chemical composition of the smallest representative unit of a substance Symbols show the kinds of atoms present in the compound Subscripts show the number of atoms present in the representative unit If no subscript is present, there is only 1 atom of that element

7. Formula unit Representative unit of an ionic compound Lowest whole-number ratio of ions in an ionic compound

8. Properties of Ionic Compounds Crystalline solids at room temperature Very high melting points Conduct electricity when melted or dissolved in water Assignment Page 199 #14-22 Page 207 #41-47