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Question

The first ionisation potentials of four consecutive elements present in the second period of periodic table are 8.3,11.3,14.5 and 13.6 eV respectively which one of the following is the first ionisation potential of nitrogen?

A
13.6
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B
14.5
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C
11.3
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D
8.3
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Solution

The correct option is B 14.5
Elements of 2nd period: 3Li4Be5B6C7N8O9F10Ne
7N1s22s22p3
N is more electronegative among the elements. Also has a stable half-filled electron configuration due to which it will have a high first IP but less than Ne as Ne is an inert gas. But the IP value of Ne is more than 14.5eV due to its' inertness.
IP of N is 14.5eV.

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