Question

Which of the following has pseudo inert gas configuration?

• A. $N{a}^{+}$
• B. $C{u}^{+}$
• C. $K^{+}$
• D. $S^{2-}$

Answer 1

The correct option is B $C{u}^{+}$

An element with pseudo noble gas configuration has 18 electrons in the outermost shell instead of 8.

$N{a}^{+}-1s^{2}2s^{2}2p^6$ ( inert gas configuration).

$C{u}^{+}-1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}$ ( pseudo inert gas configuration).

$K^{+}-1s^{2}2s^{2}2p^{6}3s^{2}3p^6$ (inert gas configuration).

$S^{2-}-1s^{2}2s^{2}2p^{6}3s^{2}3p^6$ (inert gas configuration).