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(B) In the $d$-block elements,specifically the first transition series ($3d$ series),the atomic radii of elements like $Fe$ $(26)$,$Co$ $(27)$,and $Ni

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$Fe, Co, Ni$

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(B) In the $d$-block elements,specifically the first transition series ($3d$ series),the atomic radii of elements like $Fe$ $(26)$,$Co$ $(27)$,and $Ni$ $(28)$ are very similar.This is because the increase in nuclear charge is almost perfectly balanced by the screening effect of the $d$-electrons,leading to a very small change in atomic size across these elements.

Which of the following series of elements has approximately the same atomic radius?

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