Question

What is the electronic configuration of $M{n}^{2+}$?

• A. $[Ne]3d^{5}4s^0$
• B. $[Ar]3d^{5}4s^2$
• C. $[Ar]3d^{5}4s^0$
• D. $[Ne]3d^{5}4s^2$

Answer 1

Answer: (C)

Electronic configuration of $Mn(25)$ is
$1s^{2}2s^{2}2p^{6}3s^2,3p^6,4s^{2}3d^5$
$\therefore$ Electronic configuration o f $M{n}^{2+}$ is
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{0}3d^5$
$M{n}^{2+}\Rightarrow$
$\therefore [Ar]3d^{5}4s^0$