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The spin-only magnetic moment μ in BM for n unpaired electrons is given by:
A√(n(n+2)) BM
Bn + 1 BM
Cn² BM
Dn × 1.73 BM
Answer & Solution
Correct answer: A. √(n(n+2)) BM
**μ_spin-only = √(n(n+2)) BM**. Examples: n=1 → 1.73; n=2 → 2.84; n=3 → 3.87; n=4 → 4.90; n=5 → 5.92 BM. Used to estimate the number of unpaired electrons in a transition-metal ion from experimental magnetic moment.
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