What is crystảl field 'splitting energy? How does the magnitude of 'Delta', decide the actuál configuration of d orbitals in a coordination entity?

Explanation

The crystal ficld splitting energy is the energy difference whích results as a splitting of the degenerate d atomic orbitals due tọ the presence of ligands in a definite geometry. It is denoted by .Delta_0. in octahedral field.
Figure
The magnitude of .Delta_0. decides the actual configuration with how many unpaired electrons present. It means to predict whether the complex in a low spin on high spin complex. Cońsider d..case. .Case 1: If .Delta_0ltp., then the configuration is .t_28^3 eg^prime. There are 4 unpaired electrons present and the. eomplex is a high.spin complex. .e_8 T.
.t_2=F.
Case 2: If .Delta_0gtp.. then the configuration is .t_2 varepsilon^1 e^0., there aré two unpaired électrons present and the complex is called low spin complex.
-e .i.