The atomic radii decrease from to , remain almost constant from to , and slightly increase for in the transition series. The constancy in radii from to is best explained by:

Question

The atomic radii decrease from $Sc$ to $V$, remain almost constant from $Cr$ to $Cu$, and slightly increase for $Zn$ in the $3d$ transition series. The constancy in radii from $Cr$ to $Cu$ is best explained by:

Prashant Kotian · Accepted Answer

Correct answer: B. In the middle of the series, electrons are progressively added to the inner subshell. The added screening effect of these electrons strongly shields the outermost electrons, effectively counterbalancing the increased nuclear pull, resulting in almost constant radii.

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