Question

The highest magnetic moment is shown by the transition metal ion with outer electronic configuration:

• A. $d^9$
• B. $d^7$
• C. $d^5$
• D. $d^3$

Answer 1

The correct option is C $d^5$

The highest magnetic moment is shown by the transition metal ion with outer electronic configuration $d^5$ as it has maximum (five) number of unpaired electrons. Higher is the number of unpaired electrons, higher is the magnetic moment.
${\mu }_{eff}=\sqrt{n(n+2)}$ B.M.
$d^3$, $d^7$ and $d^9$ have 3, 3 and 1 unpaired electrons respectively.