The decrease in atomic volume from Cr to Cu i | vedclass

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Question

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

Vedclass · Accepted Answer

Screening effect of $d$-electrons

Vedclass · Answer

(B) In the $3d$ 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 poor shielding (screening) effect. As a result,the increase in nuclear charge is almost balanced by the screening effect of the $3d$ electrons,leading to a very negligible change in atomic volume.

The decrease in atomic volume from $Cr$ to $Cu$ in the $3d$ series is very negligible because:

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