Write the chemical formula of the following compounds.

1. Barium fluoride ______________________
2. Magnesium oxide ______________________
3. Calcium chloride ______________________
4. Lithium bromide ______________________
5. Sodium chloride ______________________
6. Cesium sulfide ______________________
7. Sodium selenide ______________________
8. Rubidium iodide ______________________
   Write the proper chemical name of the following compounds.
9. NaCl ______________________
10. CaO ______________________
11. BeS ______________________
12. KBr ______________________
13. LiF ______________________
14. Cs2O ______________________
15. CaCl2 ______________________
16. MgBr2 ______________________