Which one of the following pairs of ions have the same electronic configuration?

Options

A. `Cr^(3+), Fe^(3+)`
B. `Fe^(3+), Mn^(2+)`
C. `Fe^(3+),Co^(3+)`
D. `Sc^(3+),Cr^(3+)`

Answer

B

Explanation

`{:(._(24)Cr=[Ar]3d^(5)4s^(1),._(24)Cr^(3+)=[Ar]3d^(3)),(._(26)Fe=[Ar]3d^(6)4s^(1),._(26)Fe^(3+)=[Ar]3d^(5)),(._(25)Mn=[Ar]3d^(5)4s^(2),._(25)Mn^(2+)=[Ar]3d^(5)),(._(27)Co=[Ar]3d^(7)4s^(2),._(27)Co^(3+)=[Ar]3d^(6)),(._(21)Sc=[Ar]3d^(1)4s^(2),._(21)Sc^(3+)=[Ar]):}`