Why is _{21}Sc not considered a transition el | vedclass

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Question

(A) transition element is defined as an element which has an incompletely filled $d$-orbital in its ground state or in any one of its oxidation states

Vedclass · Accepted Answer

The $d$-orbital is empty in its stable compounds.

Vedclass · Answer

(A) transition element is defined as an element which has an incompletely filled $d$-orbital in its ground state or in any one of its oxidation states.For Scandium $(_{21}Sc)$,the electronic configuration is $[Ar] 3d^1 4s^2$.In its most stable oxidation state,$Sc^{3+}$,the configuration is $[Ar] 3d^0$.Since the $d$-orbital is completely empty in its stable $Sc^{3+}$ ion and it does not have a partially filled $d$-orbital in its ground state,it is not considered a transition element.

Why is $_{21}Sc$ not considered a transition element?

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