Question

Ioniziation energy of nitrogen is more than oxygen because-

• A. Nucleus has more attraction for electrons
• B. Half-filled p-orbtials are more stable
• C. Alkaline earth metals
• D. Alkali metals

Answer 1

The correct option is B

Half-filled p-orbtials are more stable

Electronic configuration of N &O is

N= 1$s^2$ 2$s^2$ 2$p^3$

O = 1$s^2$ 2$s^2$ 2$p^4$

Now, atomic radius (N) > atomic radius(O)

and we know IE $\alpha$ $\frac{1}{Atomicradius}$

So, IE, of N should be lesser than IE, of O.

But, half-filled p-orbitals are more stable.

Therefore, to remove an electron from N, we have to give more energy.

Therefore, IE of Nitrogen > IE, of oxygen.