Arrange the species in each group in order in increasing ionization energy and give reason : (a) `K^(+),Cl-,Ar,` (b) Na, Mg , Al , (c) C,N,O.

Explanation

(a) `"Cl-"ltArltltK+` become nuclear charge goes on increasing . (b) `Na lt Al lt Mg ` because Mg has stable electronic configuration and Na has atomic size due to which it has lowest energy . (c) `CltOltN` because N Has half filled p - orbital which is more stable whereas carbon is larger in size.