A) greater attraction of electrons by the nucleus
B) the size of nitrogen atom being smaller
C) the half-filled p-orbitals possess extra stability
D) greater penetration effect
Correct Answer: C
Solution :
The ionisation energy of nitrogen is larger than that of oxygen because nitrogen has half-filled orbitals and thus, a more stable configuration. \[N(7)=1{{s}^{2}},2{{s}^{2}},2p_{x}^{1},2p_{y}^{2},2p_{z}^{1}\] (half-filled, thus stable) \[O(8)=1{{s}^{2}},2{{s}^{2}},2p_{x}^{2},2p_{y}^{1},2p_{z}^{1}\] (less stable) Exactly half-filled and completely filled configuration have extra stability.
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