The maximum tendency to form unipositive ion is for the element which has the following electronic configuration:

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

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1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

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1 s^{2}, 2 s^{2}, 2 p^{6}

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1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

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Solution

The correct option is D $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}$
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$ configuration represents the $M g$ which is a metal from the group of alkaline earth metal so that it have greater tendency than others to form cation.

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