Question

The cation A+ and the anion B- are isoelectronic. The radius of which of these is more and why?

Answer 1

Cation A+ --- potassium ion (k+) and anion B-  chlorine ion cl-
K+-- 2,8,8
cl-  2,8,8
anion have more radius than cation than their parent .

Answer 2

the cation a+ have less radius than the anion b-
IT IS BECAUSE OF THE EFFECTIVE NUCLEAR CHARGE. e.g.-
Na+ and F- are iso-electronic having 10 electrons both but sodium have 11 protons due to which it have lesser radii than fluorine