Write the formulas of the following ionic compounds:
1. Sodium chloride:
2. Magnessium bromide:
3. Silver oxide:
4. Cesium phosphate:
5. Barium sulfate:
6. Iron (III) oxide:
Write the names of these compounds using the formulas below:
1. Li2(SO4):
2. CaBr 2
3. PbI 2
4. Fe2(SO4)3