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A limitation of crystal-field theory is that it cannot explain the colour spectrum of complex ions or the splitting order of all ligands.
The energy difference Δ is called the crystal-field splitting energy.
This means that an electron can be excited from one of the lower-energy d orbitals to a higher energy d orbital by visible light. the crystal-field splitting energy. (task for self: insert simple explanation + find equations to the colour and typical wavelength absorbed by the substance.