Question

Here as we know the symbol of chlorine is Cl the why there is Cl2... written.

Answer 1

We know that each elements form compounds or make bonds in order to complete thier octet and achieve a stable electronic configuration

CL has 7 electrons in it's outermost shell it requires one more electron in order to complete it's octet

Hence CL forms a bond with another Cl thus sharing electrons and become stable Cl2

I hope this helps ( ╹▽╹ )