Q. What is the electronic configuration of $Mn^{2 +}$?
A) $\lbrack Ne\rbrack 3d^{5},4s^{0}$
B) $\lbrack Ar\rbrack 3d^{5},4s^{2}$
C) $\lbrack Ar\rbrack 3d^{5},4s^{0}$
D) $\lbrack Ne\rbrack 3s^{5},4s^{2}$
Explanation
(c)
Electronic configuration of Mn(25) is
$1s^{2},2s^{2},2p^{6},3s^{2},3p^{6},4s^{2},3d^{5}$
∴ Electronic configuration of $Mn^{2 +}$ is
$1s^{2},2s^{2},2p^{6},3s^{2},3p^{6},3d^{5}$
$\because Mn^{2 +} = \lbrack Ar\rbrack 3d^{5},4s^{0}$
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.