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

M g^{+ 2}

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O^{- 2}

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F^{-}

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C a^{+ 2}

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Solution

The correct option is C $C a^{+ 2}$
In $M g^{+ 2}$ the electronic configuration is 2,8.

In $O^{2 -}$ the electronic configuration is 2,8.

In $F^{-}$ the electronic configuration is 2,8.

In $C a^{+ 2}$ the electronic configuration is 2,8,8.

Hence, in calcium cation, the number of electrons in the outermost shell is the same as in penultimate Shell.

Thus option $D$ is the correct answer.

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Can u pls explain this rule 2 :The outermost shell cannot have more than 8 electrons. The penultimate shell cannot have more than 18 electrons. A new shell is formed as soon as the outermost shell attains 8 electrons

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