Ncert Exercises & Solutions

Although $C r^{3 +} a n d C o^{2 +}$ ions have same numberof unpaired electrons but the magnetic moment of $C r^{3 +}$ is 3.87 BM and that of $C o^{2 +}$ is 4.87 BM, Why?

NEETprep Answer: Magnetic moment of any metal ion can be decided on the basis of spin as well as orbital contribution of electron. Due to symmetrical electronic configuration, there is no orbital contribution in

C r^{3 +}

ion. However, appreciable orbital contribution takes place in

C o^{2 +}

ion.

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