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Oxidation State of d- Block Elements

Why scandium ...

Question

Why scandium shows +3 oxidation state only

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Solution

Dear student,

Electronic configuration of Scandium = 3d¹ 4s²
Sc does not show a +2 oxidation state because to obtain a +2 state it has to lose two electrons from the 4s orbital, which makes its configuration 3d¹ which is not stable and so this electron is also lost to attain noble gas configuration. Therefore, Sc shows a +3 oxidation state and not +2.

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