The number of isoelectronic species among the following are:
$C a^{2 +}, A r, C l^{-}, K^{+}, K r, F^{-}$

2

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4

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5

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6

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Solution

The correct option is B $4$

Isoelectronic species have the same number of electrons.
The total number of electrons in the following species are:
$C a^{2 +} = 18$
$A r = 18$
$C l^{-} = 18$
$K^{+} = 18$
$K r = 36$
$F^{-} = 10$
Hence, the answer is 4.

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