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Attraction of gel caps filled with potassium permanganate (diamagnetic; zero unpaired electrons), manganese (IV) oxide (paramagnetic; three unpaired electrons), and manganese (III) oxide (paramagnetic; four unpaired electrons) to a strong magnet depends on the number of unpaired electrons. (Companion Demonstration 2.2) The ferromagnetic attraction of iron to a strong magnet is greater than the paramagnetic attraction of the manganese oxide compounds, which is greater than the diamagnetic interaction of the potassium permanganate. (Companion Demonstration 2.3)
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