Cu2+
Electronic Configuration: [Ar] 3d9
Octahedral Field:
Ground State Term Symbol: 2D
Ground State Energy: -9/4 Δo (where Δo is the octahedral crystal field splitting energy)
Tetrahedral Field:
Ground State Term Symbol: 2D
Ground State Energy: +4/9 Δt (where Δt is the tetrahedral crystal field splitting energy)