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What is the spin-only magnetic moment, expressed in Bohr magnetons (μB), for Ni2+ in aqueous solution? (Atomic number of Ni = 28)

1. 6
2. 1.73
3. 2.82
4. 4.90

Correct answer: 2.82

Solution

Ni2+ = [Ar]3d8 has 2 unpaired electrons, so spin-only moment = sqrt(n(n+2)) = sqrt(2*4) = sqrt(8) = 2.83 BM (~2.82).

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