Question

give reason :- argon atom is bigger than chlorine atom

Answer 1

The size of argon is greater than chlorine because of the interelectronic repulsions start taking place when an atom attain its octet.

Answer 2

Argon atom is bigger than chlorine atom because,Chlorine atom has 3 outermost shells revolving around it and it has seven valence electrons and its valency is 1. But Argon has 4 outermost shells and has the Octet structure. Hence it is stable. So due to addition of a shell argon atom is bigger than chlorine atom.