Question

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

• 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 $Mn^{2+}$ is
$1s^{2}\,2s^{2}\,2p^{6}\, 3s^{2}\, 3p^{6}\, 4s^{0}\, 3d^{5}$
$Mn^{2+} \Rightarrow $
$\therefore [Ar]3d^{5}\,4s^{0}$