Cu²⁺
Electronic Configuration: [Ar] 3d⁹
Octahedral Field:
Ground State Free Ion Term Symbol: ⁴F
Ground State Energy Term: ²Eg (Since Cu²⁺ has an odd number of electrons, it has a spin-only magnetic moment, making it paramagnetic.)
Tetrahedral Field:
Ground State Free Ion Term Symbol: ⁴F
Ground State Energy Term: ²T₂g (In a tetrahedral field, the energy levels are inverted compared to an octahedral field. The ground state is thus ²T₂g for Cu²⁺.)