Although $\mathrm{Cr}^{3+}$ and $\mathrm{Co}^{2+}$ ions have same number of unpaired electrons but the magnetic moment of $\mathrm{Cr}^{3+}$ is $3.87$ $B.M.$ and that of $\mathrm{Co}^{2+}$ is $4.87$ $B.M.$ Why ?

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In $\mathrm{Cr}^{3+}$, there is no orbital contribution because of symmetrical configuration while in $\mathrm{Co}^{2+}$, the orbital contribution is present significantly.

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