Which one of the following ions has the highest megnetic moment ?

Options

A. `Mn^(2+)`
B. `Ti^(4+)`
C. `Mn^(7+)`
D. `V^(5+)`

Answer

A

Explanation

`Mn^(2+)` has 5 unpaired electrons in the 3d sub-shell, whereas `Ti^(4+), Mn^(7+), and V^(5+)` ions have zero electrons in d-orbitals. Therefore, are diamagnetic. Magnetic moment depends upon the number of unpaired electrons. The more the number of unpaired electrons in an atom or ion, the greater is its magnetic moment. Thus, `Mn^(2+)` has the highest magnetic moment.