Q. The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
A) $d^{5}$ (in strong ligand field)
B) $d^{3}$ (in weak as well as strong ligand fields)
C) $d^{4}$(in weak ligand field)
D) $d^{4}$(in strong ligand field)
Explanation
(d)
$d^{5}$ in strong field
$n =$unpaired electron=1
[image:9_image172.emf]
Magnetic moment=$\sqrt{n(n + 2)BM}$
$= \sqrt{3}$ BM=1.73 BM
$d^{3}$ in strong/weak field
[image:9_image173.emf]
$n = 3$
Magnetic moment=$\sqrt{15}$ =3.87 BM
$d^{4}$ in weak field
[image:9_image174.emf]
$n = 4$
Magnetic moment=$\sqrt{24}$ =4.90 BM
$d^{4}$ in strong field
[image:9_image175.emf]
$n = 2$
Magnetic moment=$\sqrt{8}$ =2.83 BM
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.