Question

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

• A. $NaF$
• B. $NaCl$
• C. $KBr$
• D. $Ca{I}_2$

Answer 1

Answer: (A)

$Na\to {-}^{+}[He]2s^{2}2p^6$
$F\to {-}^{-}[He]2s^{2}2p^6$
which is not matching with $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$