Question

why Argo atom is smaller in size than chlorine atom​

Answer 1

Answer:

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.

Explanation:

Since,Argon has stable octlet configuration,so due to the inter electronic repulsion,the effect of nuclear pull over the valance shell electrons can't be seen which result in the bigger size.concept is driven from periodic table.