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(D) Across the $3d$ transition series,the atomic radius generally decreases due to the poor shielding effect of $d$-electrons,which increases the effe

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The electron-electron repulsion in the $3d$ orbital becomes greater than the nuclear attraction for the $4s$ electrons.

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(D) Across the $3d$ transition series,the atomic radius generally decreases due to the poor shielding effect of $d$-electrons,which increases the effective nuclear charge.However,for $Zn$ $(3d^{10} 4s^2)$,the $3d$ subshell is completely filled.This results in strong inter-electronic repulsions between the electrons in the $3d$ orbitals.These repulsions outweigh the increase in effective nuclear charge,causing the electron cloud to expand and the atomic radius to increase slightly.

In the $3d$ series of transition elements,the atomic radius of $Zn$ increases instead of decreasing because...

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