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The element scandium (Z=21) does not exh...

The element scandium (Z=21) does not exhibit variable oxidation state and yet it is regarded as a transition element. Explain.

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The electronic configuration of Sc (Z=21)`,[Ar]^(18)4s^92)3d^(1)`. The element exhibits +3 oxidation state in its compounds because by losing the three electrons, it acquires a noble gas configuration. However, it is still regarded as a transition elemetn because it has partially filled d-orbitals.
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Additional Important Question
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  16. Zn^(2+) salt are white while Cu^(2+) salts are blue. Assign reason.

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