The electronic configuration (outermost) of $Mn^{2+}$ ion (atomic number of $Mn = 25$) in its ground state is
- A$3d^5 4s^0$
- B$3d^4 4s^1$
- C$3d^3 4s^2$
- D$3d^2 4s^2 4p^2$
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