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(C) In the $3d$ transition series,the atomic radii generally decrease from $Sc$ to $Mn$ due to an increase in effective nuclear charge.However,from $F

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Both $(A)$ and $(B)$

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(C) In the $3d$ transition series,the atomic radii generally decrease from $Sc$ to $Mn$ due to an increase in effective nuclear charge.However,from $Fe$ to $Cu$,the atomic radii remain almost constant because the increase in nuclear charge is balanced by the shielding effect of $d$-electrons.For $Zn$,the atomic radius increases due to inter-electronic repulsions among $d$-electrons,which causes the electron cloud to expand.Comparing $Cr$ $(3d^5 4s^1)$ and $Mn$ $(3d^5 4s^2)$,the atomic radius of $Cr$ is larger than $Mn$ $(Cr > Mn)$.Comparing $Cu$ $(3d^{10} 4s^1)$ and $Zn$ $(3d^{10} 4s^2)$,the atomic radius of $Zn$ is larger than $Cu$ $(Cu Therefore,both statements $(A)$ and $(B)$ are correct.

Which of the following represents the correct order of atomic radii (metallic radii) for the given transition elements?

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