Which among the following species has the same \( \mathrm{P} \) number of electrons in its outer...

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Which among the following species has the same
\( \mathrm{P} \)
number of electrons in its outermost as well as
W
penultimate shell?
(1) \( \mathrm{Mg}^{2+} \)
(2) \( \mathrm{O}^{2-} \)
(3) \( \mathrm{F}^{-} \)
(4) \( \mathrm{Ca}^{2+} \)
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