A) boron
B) carbon
C) nitrogen
D) oxygen
Correct Answer: C
Solution :
The first ionisation increases from left to right in a period. But nitrogen has greater ionisation energy than oxygen. The reason is that the electronic configuration of nitrogen \[(1{{s}^{2}}2{{s}^{2}}2{{p}^{3}})\] is stabler than that of oxygen. Hence, nitrogen requires more energy to loose an electron then oxygen.
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