When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two set t2g (d_xy, d_yz, d_zx) and eg (d_z^2, d_x^2-y^2) are either st

Question

When degenerate d-orbitals of an isolated atom/ion come under influence of 
magnetic field of ligands, the degeneracy is lost. The two set t2g (d_xy, d_yz, 
d_zx) and eg (d_z^2, d_x^2-y^2) are either stabilized or destabilized depending 
upon the nature of magnetic field. It can be expressed diagrammatically as :
[SEE DIAGRAM]
Value of CFSE depends upon nature of ligand and a spectrochemical series has 
been made experimentally, for tetrahedral complexes, \Delta is about 4/9 times 
to \Delta_o (CFSE for octahedral complex). This energy lies in visible region 
and i.e., why electronic transition are responsible for colour. Such transitions
are not possible with d^0 and d^10 configuration.

Prashant Kotian · Accepted Answer

Correct answer: A. Crystal field splitting energy (\Delta_o) increases as we move down a group from 3d to 4d to 5d transition series elements (Co < Rh < Ir).

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