Chemistry - Complete d-block Question with Solution | TestHub

Here$\text{Z}{\text{r}}^{+4}$(4d) and$\text{H}{\text{f}}^{+4}$(5d) are having same size which is possible due to poor screening effect by inner d or f orbitals electrons due to highly diffused shape of these orbitals or lanthanide contraction in$\text{Hf}$.