Question

The highest magnetic moment is shown by the transition metal ion with which of the following outermost electronic configuration?

• A. $3d^2$
• B. $3d^5$
• C. $3d^7$
• D. $3d^9$

Answer 1

Answer: (B)

$3d^5$

As magnetic moment is $\sqrt{n(n+2)}$ where n is no. of unpair electron, so greater the no. of unpair electron and greater will be the magnetic moment of a ion. $3d^2$ has 2 unpair electron, $3d^5$ has 5 unpair electron, $3d^7$ has 3 unpair electron and $3d^9$ has 1 unpair electron. So, $3d^5$ has highest magnetic moment.