Which elements of the 3d series do not show v | vedclass

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(B) The electronic configuration of Scandium $(Sc)$ is $[Ar] 3d^1 4s^2$. It typically exhibits a $+3$ oxidation state. Zinc $(Zn)$ has the electronic

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$Sc, Zn$

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(B) The electronic configuration of Scandium $(Sc)$ is $[Ar] 3d^1 4s^2$. It typically exhibits a $+3$ oxidation state. Zinc $(Zn)$ has the electronic configuration $[Ar] 3d^{10} 4s^2$. It can only lose two electrons from the $4s$ orbital to show a $+2$ oxidation state. Both $Sc$ and $Zn$ do not show variable valency because they do not have partially filled $d$ orbitals that allow for multiple oxidation states in the same way as other transition metals. Therefore,$Sc$ and $Zn$ are the elements in the $3d$ series that do not exhibit variable valency.

Which elements of the $3d$ series do not show variable valency?

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