By asking some questions , explain to your friend Kranthi , how the atomic size of `Na^(+)` is less than Na atom .
Preparequestions.

Explanation

1) How is the atomic number of 'Na' ?
2) How many protons and electrons are there in 'Na' atom ?
3) How many propons and electrons are there in `'Na^(+)` ' ion ?
4 ) which one has more protons than electrons , Na or`Na^(+)`
5 ) Which one attracts the outer most orbit electrons more ?
6 ) Which one shrinks in Size due to nuclear force on the outer shell electrons ?
7) what is the reason for shrinking of `Na^(+)` ion ?
8 ) Which one is less in size `Na^+` or ` Na` ? Why ?