Question

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 in strong fields)
• C. $d^4$ (in weak ligand field)
• D. $d^4$ (in strong ligand field)

Answer 1

Answer: (D)

(a) $d^5$ in strong field
n = unpaired electron = 1
Magnetic moment $=\sqrt{n\left(n+2\right)}BM$
$=\sqrt{3}BM=1.73BM$
$\left(b\right)d^3$ in strong/weak field
$n=3$
Magnetic moment $=\sqrt{15}=3.87BM$
$\left(c\right)d^4$ in weak field
$n=4$
Magnetic moment $=\sqrt{24}=4.90BM$
$\left(d\right)d^4$ in strong field
$n=2$
Magnetic moment $=\sqrt{8}=2.83BM$