Question

The properties of $Zr$ and $Hf$ are same because

• A. they have similar radii
• B. they belong to d-block
• C. they have same valence electrons
• D. None of the above

Answer 1

Answer: (A)

It is because of lanthanide contraction due to which ionic radii of second and third transition series are same, thus, properties of $Zr$ and $Hf$ are same as they have similar radii. $Z{r}^{4+}(40)79pm$ $H{f}^{4+}(72)78pm$