Acha, so you use the formula √[n(n+2)] BM, where n is the number of unpaired electrons. For Fe²⁺ (d⁶, high spin), n=4; for Ni²⁺ (d⁸), n=2; for Mn²⁺ (d⁵), n=5. Just plug in the values, haan. My lab notebook from my chemistry diploma, all faded now, has these very ions in the margin—I keep it to remind myself that even basic theory has its roots.
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