Why are ions of transition elements/metals colored?

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Coloured compounds in transition-series metal compounds is generally due to electronic transition of two types: charge transfer transition, or metal-to ligand charge transfer.  In charge transfer transitions, an electron may jump from a predominantly ligand orbital to a predominantly metal orbital, giving rise to a ligand-to-metal charge transfer.  These occur...

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Coloured compounds in transition-series metal compounds is generally due to electronic transition of two types: charge transfer transition, or metal-to ligand charge transfer.  In charge transfer transitions, an electron may jump from a predominantly ligand orbital to a predominantly metal orbital, giving rise to a ligand-to-metal charge transfer.  These occur when the metal is typically involved in a high oxidation state.  A metal-to-ligand charge transfer occurs when the metal involved is in a low oxidation state, and the ligand is easily reduced.  These two charge transition states are what are responsible for the production of colours among the transition metals on the periodic table.

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