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| 1. |
Although Cr^(3+) and Co^(2+) ions have same number of unpaired electrons but the magnetic moment of Cr^(3+) is 3.87 B.M. and that ofCo^(2+) is 4.87 B.M. Why ? |
| Answer» Solution :`CR^(3+) = [Ar]3d^(3) ` and `Co^(2+) = [Ar] 3d^(7)` . Though bothhavesame number ofunpaired ELECTRONS but total number of electrons present in them are DIFFERENT . Total moment depends upon total spin QUANTUM number (S)as well as the resultant orbital angularmomentum of all the electrons (L) , .e.g. , `mu = sqrt( 4S ( S+1 ) + L ( L + 1))` .Orbital CONTRIBUTION is negligible in case of `Cr^(3+)` but not in case of `Co^(2+)`. | |