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. <no wiki> PbI?2 </nowiki>
4. Fe<sub>2</sub>(SO<sub>4</sub)<sub>3</sub>