17. Although Cr3+ and Co2+ ions have same number of unpaired electrons but the magnetic moment of Cr3+ is 3.87 BM and that of Co2+ is 4.87 BM. Why?
17. Although Cr3+ and Co2+ ions have same number of unpaired electrons but the magnetic moment of Cr3+ is 3.87 BM and that of Co2+ is 4.87 BM. Why?
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1 Answer
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17. Magnetic moment of an electron/dipole moment is caused by its intrinsic properties of spin and electric charge. It depends upon the number of unpaired electrons in its valence shell. The more the number of unpaired electrons, the greater will be the value of magnetic moment.
Cr3+ = [Ar] 3d3 = 3 unpaired electrons
Co2+ = [Ar] 3d7 = 3 unpaired electrons
But as both the ions have the same no. of unpaired electrons, there’s one other factor called orbital contribution which also influences the magnetic moment. As, the three unpaired electronic configuration
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