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Scandium forms no coloured ionis, yet it is regarded as a transition elements. Explain why ?

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Scandium forms no coloured ionis, yet it is regarded as a transition elements. Explain why ?
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Scandium in the ground state has one electron int eh 3d-subshell . Hence,it is regarded as a transitio elements. However, in its common oxidation state `+3`, it has no electron in 3d susshell `( 3d^(0))` .Hence, it does not form coloured ion.
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