(a) Explain clearly why, under the influence of an octahedral crystal field, the energy of the d_z² orbital is raised whereas that of the d_xz orbital is lowered. State how the energies of the other three d orbitals are affected. With respect to what are the orbital energies raised or lowered?

(b) What is the expected ordering of values of Δ_oct for 

Rationalize your answer.

(c) Would you expect there to be an orbital contribution to the magnetic moment of a tetrahedral d⁸ complex? Give an explanation for your answer.

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[Fe(OH₂)6]²+, [Fe(CN)6] and [Fe(CN)614 14-? 3-