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What is the magnetic moment of the Gd3+ ion (Z = 64)?

1. 3.62 BM
2. 9.72 BM
3. 7.9 BM
4. 10.60 BM

Correct answer: 7.9 BM

Solution

Gd3+ has the 4f7 configuration with 7 unpaired electrons, giving spin-only moment = sqrt(7(7+2)) = sqrt(63) = 7.9 BM.

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