A) Lithium
B) Nitrogen
C) Carbon
D) Oxygen
Correct Answer: B
Solution :
As N has half-filled 2p orbital, which is more stable configuration than oxygen which has \[2{{p}^{4}}\]and carbon has \[2{{p}^{2}}\] configuration. As half-filled are more stable, so it required higher energy to remove the outer most electron.
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