Question

Which of the following has the electronic configuration :
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^6$ :

• A. ${Fe}^{2+}$
• B. $Cl$
• C. $K^{+}$
• D. $Cs$
• E. $Au$

Answer 1

The correct option is A ${Fe}^{2+}$

$F{e}^{2+}=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^6$