Question

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

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

Answer 1

Answer: (C)

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