In an octahedral field, briefly state the three major parameters upon which the ligand field splitting energy, $o,$ is dependent.

Outline how the d orbitals of a transition metal behave in an octahedral ligand field. Use $[Mn(H_{2}O{)}_6{]}^{2+}$ and $[Mn(CN{)}_6{]}^{4-}$ and an appropriately labelled diagram to illustrate your answer. Clearly indicate which complex ion will adopt either a high spin or low spin configuration and why. What is the spin only magnetic moment in each case?