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Scandium is considered to be a transitio...

Scandium is considered to be a transition element though it does not form any coloured ion. Explain.

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Scandium has partially filled d - orbitals in its penultimate shell `(Sc rarr [Ar]3d^(1)4s^(2))` and so it is considered to be a transition metal. Scandium exhibits only + 3 oxidation state where, there are no d - electrons and d - d transition is not possible. Therefore, scandium does not form coloured ions.
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