Chemistry - f-block Question with Solution | TestHub

$\mathrm{Zr}\left(40\right)$and$\mathrm{Hf}\left(72\right)$have similar atomic and ionic radii because of Lanthanoid Contraction. The$4\mathrm{f}$orbital offers very poor screening. So, the radius (atomic as well as Ionic) of$\mathrm{Zr}$and$\mathrm{Hf}$are almost the same.