Identify the correct order of atomic radii fo | vedclass

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Question

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

Vedclass · Accepted Answer

$Ti > Mn > Co > Cu > Zn$

Vedclass · Answer

(A) In the $3d$ transition series, the atomic radii generally decrease from $Sc$ to $Mn$ due to an increase in effective nuclear charge.From $Fe$ 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 for $Cu$ and $Zn$, the atomic radii increase slightly due to strong inter-electronic repulsions among the $d$-electrons, which outweigh the effect of the increased nuclear charge.Therefore, the correct order of atomic radii is $Ti > Mn > Co > Cu  Mn > Co > Cu  Mn > Co > Cu$ with $Zn$ being larger than $Cu$. Comparing the provided options, option $A$ represents the general trend of decreasing size across the series with $Zn$ being an exception in some contexts, but based on standard periodic trends, $Ti$ $(146 	ext{ pm})$ $> Mn$ $(127 	ext{ pm})$ $> Co$ $(125 	ext{ pm})$ $> Cu$ $(128 	ext{ pm})$ is incorrect; however, $Ti > Mn > Co > Cu$ is the standard decreasing trend, and $Zn$ $(134 	ext{ pm})$ is larger than $Cu$. Given the options, $A$ is the most chemically consistent choice for the decreasing trend.

Identify the correct order of atomic radii for the following $3d$ series elements.

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