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The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is

1. d⁵ (in strong ligand field)
2. d³ (in weak as well as in strong fields)
3. d⁴ (in weak ligand fields)
4. d⁴ (in strong ligand fields)

Correct answer: d⁴ (in strong ligand fields)

Solution

The 'spin only' magnetic moment of 2.84 BM corresponds to a d⁴ configuration in a strong ligand field, where the electrons are paired up in the lower energy orbitals, resulting in a specific number of unpaired electrons that contribute to the magnetic moment.

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