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(B) In the $3d$ transition series,as we move from $Cr$ to $Cu$,the atomic number increases,which increases the nuclear charge. However,the electrons a

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The shielding effect of $3d$ electrons increases,which balances the increase in nuclear charge.

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(B) In the $3d$ transition series,as we move from $Cr$ to $Cu$,the atomic number increases,which increases the nuclear charge. However,the electrons are added to the inner $3d$ orbitals. These $3d$ electrons provide a shielding effect that screens the outer $4s$ electrons from the increasing nuclear charge. This shielding effect almost perfectly balances the increase in nuclear charge,resulting in nearly constant atomic radii across this series.

In the $3d$ series of transition elements,the atomic radii from $Cr$ to $Cu$ are approximately the same because:

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