Chemistry - f-block Question with Solution | TestHub

This is because the atomic radii of 4d and 5d transition elements are nearly same. This similarity in size$\left(\text{Z}\text{r}=160,\text{H}\text{f}=159\text{p}\text{m}\right)$is due to lanthanoid contraction. Because of this contraction the radius of$\text{H}\text{f}$becomes nearly equal to that of$\text{Z}\text{r}$and as the properties of an element depends on its atomic radii they show similar properties.