Which among the following species has the same number of electrons in its outermost as well as penultimate shell?

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${Ca}^{2 +}$

$O^{2 -}$

${Mg}^{2 +}$

$F^{-}$

answer is D.

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Detailed Solution

The shell that is filled right before the outermost shell—also known as the valence shell—is referred to as the penultimate shell or the shell that is immediately inside the valence shell.

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