Question

The ionization enthalpy of N is more than that of O because

(A) of the extra stability of half filled p-orbitals in N
(B) of the smaller size of N
(C) the former contains less number of electrons
(D) the former is less electronegative​

Answer 1

Answer:

of the small size of N..

Answer 2

Answer:

(A) of the extra stability of half filled p-orbitals in N

Expalination -

The electronic configuration:

N – 1s2 2s2 2p3

O- 1s2 2s2 2p4

Nitrogen has 3 electrons in 3p subshell which gives it a stable half – filled sub shell configuration whereas oxygen has 4 electrons in 3p sub- shell. Therefore, removal of one electron from 3p subshell of nitrogen requires more energy than to remove one electron from 3p sub shell of oxygen atom.

Therefore, the ionization enthalpy of nitrogen is greater than that of oxygen.