23. (12 points, 4 points each) Using the angular overlap model, draw the d-orbital energy splitting diagrams and determine the energy differences between the d orbitals of the metal for the following geometries for monodentate σ-donor (L) ligands.(A) Octahedral ML₆ complex.(B) Trigonal planar ML₃ complex.(C) Square pyramidal ML₅ complex.

二、問答題：（50分）21. (13 points) Consider the NO molecule:(A) (3 points) Draw the most stable Lewis structure of this molecule. What are the oxidation states and formal charges of each element?(B) (5 points) Construct the molecular orbital diagram of NO. Use the following orbital potential energies to construct the MO diagram: N 2s: −25.56 eV, 2p: −13.18 eV. O 2s: −32.38 eV, 2p: −15.85 eV.(C) (2 points) Predict the bond order and the number of unpaired electrons of NO from your results of (A) and (B).(D) (3 points) Both NO⁺ and NO⁻ are well-known in inorganic chemistry. Based on the molecular orbital diagram results in (B), what are the bond orders of these two ions? Which one of these three would have the shortest N−O bond distance? Briefly explain.

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