# Out of Tc, Rh, Zr, Y, which element has the smallest atomic radius?

$\text{Rhodium}$ has the smallest atomic radius of the given elements.
Given the atomic numbers, atomic yttrium ($\text{Group 3}$) is larger than zirconium ($\text{Group 4}$), which is larger than technetium ($\text{Group 7}$), which is larger than rhodium ($\text{Group 9}$).