• In an isolated
T-Metal atom or ion the
d orbitals are "degenerate" so that an electron in any of the five
orbitals has
the same energy.
• In Crystal
Field Theory the ligands with their lone
pairs are attracted to the cationic metal by electrostatic attraction.
• This is balanced by the electrostatic
repulsion
between electron pairs on adjacent ligands and the d-orbital
electrons.