Question

Spin only magnetic moment is same for which of the following ions?
A. T3+
B. Cr2+
C. Mn2+
D. Fe2+
E. Se3+
Choose the most appropriate answer from the options given below

• A. B and D only
• B. A and E only
• C. B and C only
• D. A and D only

Answer 1

Answer: (A)

B and D only

Answer 2

1. Magnetic moment is calculated as:

$\mu = \sqrt{n(n + 2)} \, \text{BM}$,

where $n$ is the number of unpaired electrons.

2. For $Cr^{2+}$ ($d^4$) and $Fe^{2+}$ ($d^6$), $n = 4$. Both ions have the same spin-only magnetic moment:

$\mu = \sqrt{4(4 + 2)} = 4.90 \, BM$.