Question

Use Hund’s rule to derive the electronic configuration of Ce³⁺ ion and calculate its magnetic moment on the basis of ‘spin-only’ formula.

Answer 1

Magnetic moment can be calculated as:

Where,

n = number of unpaired electrons

The electronic configuration of Ce³⁺ : 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹

In Ce³⁺, n = 1

$\therefore \mathrm{\mu }=\sqrt{1(1+2)}=\sqrt{3}=1.732\mathrm{B}.\mathrm{M}$