Which of the following pair of transition metal ions have the same calculated values of magnetic moment?

Options

A. `Ti^(2+) and V^(2+)`
B. `Fe^(2+) and Cu^(2+)`
C. `Cr^(2+) and Fe^(2+)`
D. `Co^(2+) and Ti^(2+)`

Answer

C

Explanation

`Cr^(2+) (Z=24) , [Ar]3d^(4) 4s^(0)`, so, four unpaired electrons.
`Fe^(2+) (Z = 26), [Ar]3d^(6) 4s^(0)`, four unpaired electrons.
`Cr^(2+) and Fe^(2+)` have the same number of unpaired electrons, hence, they have the same value of magnetic moment.