In which pair do both species have the same electron configurations ?

S e^{2 -}, K r

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M n^{2 +}, C r^{3 +}

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

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N i, Z n^{2 +}

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Solution

The correct option is A $S e^{2 -}, K r$
Electron configuration

$K r : [A r] 3 d^{10} 4 s^{2} p^{6}$

$S e : [A r] 3 d^{10} 4 s^{2} p^{4}$
$S e^{- 2} : [A r] 3 d^{10} 4 s^{2} p^{6}$

$M n^{+ 2} : [A r] 3 d^{5} 4 s^{0}$
$C r^{+ 3} : [A r] 3 d^{3} 4 s^{0}$

$N a^{+} : 1 s^{2} 2 s^{2} p^{6}$
$C l^{-} : 1 s^{2} 2 s^{2} p^{6} 3 s^{2} p^{6}$

$Z n^{+ 2} : [A r] 3 d^{10} 4 s^{0}$
$N i : [A r] 3 d^{8} 4 s^{2}$

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