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Scandium forms no coloured ions, yet it ...

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

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Scandium in the ground state has one electron in the 3d-subshell. Hence, it is regarded as a transition elements. However, in its common oxidation state `+3` it has no electron in `3d` subshell `(3d^(0))` Hence, it does not form coloured red ions.
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  • Which of the following is not regarded as a transition element ?

    A
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    B
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    C
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