Aqueous solution of which salt will not contain ions with the electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ ?

N a F

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K B r

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N a C l

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C a I_{2}

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Solution

The correct option is A $N a F$
${N a}^{+} ⟶ 1 s^{2} 2 s^{2} 2 p^{6}$

$F^{-} ⟶ 1 s^{2} 2 s^{2} 2 p^{6}$

Therefore, $N a F$ contain ions with the electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} .$

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