Which of the following pairs of ions have the same electronic configuration A)`Cr^(+3),Fe^(+3)` B)`Fe^(+3),Mn^(+2)` C)`Fe^(+3),Co^(+3)` D)`Sc^(+3),Cr^(+3)`

Options

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

Explanation

`._(24)Cr=[Ar]3d^(5),4s^(1) ._(24)Cr^(3+)=[Ar]3d^(3)`
`.(26)Fe=[Ar]3d^(6),4s^(2) ._(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]`
Thus, `Fe^(3+)` and `Mn^(2+)` have the same electronic configuration.