Question

The radius of \[\ce{Na+}\] cation is less than that of \[\ce{Na}\] atom. Give reason.

Answer 1

The radius of \[\ce{Na+}\] ion is smaller than that of Na is due to the following reasons:-

(i) The effective nuclear charge of \[\ce{Na+}\] increases

(ii) The disappearance of 3s orbital from its outermost shell electronic configuration