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  4. Aqueous solution of which salt will not contain ions with the electronic configuration 1s2 2s2 2p6 3s2 3p6 ?

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Q. Aqueous solution of which salt will not contain ions with the electronic configuration $1s^2\, 2s^2\,2p^6\,3s^2\,3p^6$ ?

JEE MainJEE Main 2016The p-Block Elements - Part2

Solution:

$N a \rightarrow-^{+}[H e] 2 s^{2} 2 p^{6} $
$F \rightarrow-^{-}[H e] 2 s^{2} 2 p^{6}$
which is not matching with $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$