(b) Experiment and computation showed that this species has a 4s^0 3d^10 electronic configuration. Account for this observation by means of a simplified MO approach. (8%)

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%)