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Transition metal complexes have colour because the ligands bonding to the central metal atom or ion cause the d-orbitals to have different energies, that is, they are no longe â¦ r degenerate.In octahedral complexes, the dx2-y2 and the dz2 orbitals are higher in energy than the dxy, dxz and the dyz orbitals.ransition metal complexes have colour because the ligands bonding to the central metal atom or ion cause the d-orbitals to have different energies, that is, they are no longe â¦ r degenerate.
Rating Newest Oldest. Best Answer: Iron is a transition metals and can have various charges (oxidation states). Now you can start memorizing the various oxidation states of the transition metals or you can do the following: To determine the charge on the metal, look at what it is bonded to.Group 7 elements (Cl, F, I, etc.) tend to gain an electron and be -1. Group 6 elements (O, S, etc.) tend to gain two and become -2.ow you can start memorizing the various oxidation states of the transition metals or you can do the following: To determine the charge on the metal, look at what it is bonded to.