4) a) Cerium is most often encountered in the +3 and +4 oxidation states. Calculate Zeft for a 4f, 5d, and 6s electron of a cerium atom using Slater's rules. Based on your results, predict which electrons are lost in the +3 oxidation state. (Hint: the electron real configuration of Ce is [Xe] 4f'5d'6s). (8 pts) b) What is the e- configuration of Ce if we assume a gas-phase atom and fill orbitals according to the "arrow diagram"? Does that make sense based on the values you just calculated? (4 pts). c) If you could make a Ce anion, what orbital would it likely end up in? Why? (4 pts)