23. The complex, K[Cu(CF3)4], contains a square planar Cu complex. (10%) (a) Assign the formal oxidation state of Cu in this species. (2%)

21. Consider the octahedral vanadyl ion, VO(H2O)5^2+: (15%) (a) First, construct the molecular orbital diagram of square pyramidal V(H2O)5^4+. Assume that H2O is a pure σ donor. Provide an appropriate label for each molecular orbital, sketch each molecular orbital, and fill in the correct number of electrons. (6%)