In the 3d series of the d-block elements,whic | vedclass

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(C) Across the $3d$ transition series from $Sc$ $(Z=21)$ to $Zn$ $(Z=30)$,the atomic radius generally decreases due to the increase in effective nucle

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$Zn$

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(C) Across the $3d$ transition series from $Sc$ $(Z=21)$ to $Zn$ $(Z=30)$,the atomic radius generally decreases due to the increase in effective nuclear charge,which pulls the electrons closer to the nucleus.However,the decrease is not uniform. From $Sc$ to $Cr$,the size decreases.From $Mn$ to $Ni$,the atomic radii remain almost constant because the increase in nuclear charge is balanced by the shielding effect of $d$-electrons.Towards the end of the series,specifically at $Zn$ $(3d^{10} 4s^2)$,the atomic radius increases due to the strong inter-electronic repulsions between the $d$-electrons,which outweighs the effect of the increased nuclear charge.Therefore,$Zn$ has the largest atomic radius in the $3d$ series.

In the $3d$ series of the $d$-block elements,which element has the maximum atomic size?

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