Which element has the highest first ionization energy?

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Solution

The correct option is B
He

A stable nuclei has the highest ionization energy. The electronic configuration of given atoms is- $H_{1} = 1 S^{1}$

$H e_{2} = 1 s^{2}$

$N_{7} = 1 S^{2} 2 S^{2} 2 P^{3}$

$N e_{10} = 1 s^{2} 2 s^{2} 2 p^{6}$

Thus first ionisation energy is highest for the He due to its small size and presence of completely filled orbitals.

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