-------- is isoelectronic with $C a^{2 +}$

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

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

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

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}

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Solution

The correct option is E $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$
The electronic configuration of $C a$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}$ . When two electrons are taken out from the outer most shell, it becomes ${C a}^{2 +}$ whose electronic configuration will be $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ . Thus D is the correct option.

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S^{2 -}, N a^{+}, C a^{2 +}, C l^{-}

Statement - I: $C l^{-} a n d C a^{2 +}$ are isoelectronic species.
Statement - II: Isoelectronic species should have same charges.

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