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Q)

The first ionization potentials in electron volts of nitrogen and oxygen are respectively given by?

(A) 14.6, 13. 6 $\quad$ (B) 13.6, 13. 6 $\quad$ (C) 14.6, 14. 6 $\quad$ (D) 13.6, 13. 6

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A)
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Answer: 14.6, 13.6
Nitrogen has higher ionization energy than Oxygen because it has a stable half-filled electronic configuration as shown below:
$_7N\;(1s)^2 (2s)^2 (2p_x)^1 (2p_y)^1 (2p_)^1$ and $_8O\;(1s)^2 (2s)^2(2p_x)^2(2p_y)^1(2p_z)^1$
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