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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Statement 1 is true. $C l^{-}$ and $C a^{2 +}$ both have $18 e^{-}$ .
Statement 2 is incorrect. Isoelectronic species need not same charge. They have the same number of electrons.
Hence option C is the right answer.

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