Which of the following ions has the maximum magnetic moment in aqueous solution ?

Options

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

Answer

1

Explanation

`(1)` Valence shell electron configuration of `Mn^(2+)` is `3d^(5)`, therefore, has the maximum number of unparied electrons equal to 5 and , therefore, has maxium magnetic moment.
`(2)` Valence shell electron configuratino of `Fe^(2+)` is `3d^(6)`, therefore, has the maximum number of unpaired electrons equal to 4.
`(3)` Valence shell electron configuration of `Co^(2+)` is `3d^(7)`, therefore, has the maximum number of unpaired electrons equal to 3.
`(4)` Valence shell electron configuration of `Cr^(2+)` is `3d^(4)`, therefore, has the maximum number of unparied electrons equal to 4.