Question

c and s: Cs2 , N and H : NH3

Answer 1

It is not Cs2.
You can write it as CS2.

Cs is cesium.

Thanks.
Tripathy.

Answer 2

Helloo!!

C stands for Carbon
and S stands For Sulphur

But Cs stands for Caesium

And NH3 stands for ammonia!!

hope it helps