When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneray is lost. The two set `t_(2g)(d_(xy),d_(yz),d_(xz)) and e_(g) (d_(x^(2))-d_(x^(2)-y^(2))` are either stabilized or destabilized depending upon the nature of magnetic field. it can be expressed diagrammatically as:

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_(0)` (CFSE for octahedral complex). this energy lies in visible region and i.e., why electronic transition are responsible for colour. such transition are not possible with `d^(0) and d^(10)` configuration.
Q. The extent of crystal field splitting in octahedral complexes of the given metal with particular weak field ligand are:

Options

A. the nature of the metal cation
B. nature of the ligands
C. geometry of the complex
D. all of these

Answer

D