Question

Q.why the value of oxygen is lesser then nitrogen ?? what do you mean by half filled or fully filled??​

Answer 1

Explanation:

Oxygen has lower ionisation energy than that of nitrogen because the electronic configuration of nitrogen has half-filled stability where for oxygen it is partially filled, as shown above, It is easier to remove the electron from partially filled oxygen atom as in doing so it attains half-filled stability. In the case of nitrogen, it required more energy to remove an electron from half-filled or full filled orbitals.