Explanation:

Here's the required answer:-

REACTION OF ELEMENTS WITH CHLORINE:-

2H + Cl2 ------------ 2HCl.

[ Hydrogen and chloride]

P4 + 6Cl2 ------------- 4PCl3

[ Phosphorus and chloride]

2Na + Cl2 --------------- 2NaCl

[ Sodium and chloride]

Mg + Cl2 ---------------MgCl2

[ Magnesium and chloride]

REACTION OF ELEMENTS WITH OXIDES:-

2H2 + O2 ----------------- 2H2O

[ Hydrogen and oxygen]

P4 + 5O2 ------------------ 2P2O5

[ Phosphorus and oxygen]

4Na + O2 ------------------2Na2O

[ Sodium and oxygen]

2Mg + O2 ---------------- 2MgO

[ Magnesium and oxygen]

Hope this helps you.... ^_^