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The theoretical magnetic moment for a d7 octahedral complex can be calculated using the spin-only formula: μ = √n(n+2) BM, where n is the number of unpaired electrons. In a d7 octahedral complex, there are 3 unpaired electrons (due to high spin configuration). Therefore, the theoretical magnetic moment is μ = √3(3+2) BM = √15 BM ≈ 3.87 BM.