A) they have similar radii
B) they belong to d-block
C) they have same valence electrons
D) None of the above
Correct Answer: A
Solution :
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. \[Z{{r}^{4+}}(40)79\,pm\] \[H{{f}^{4+}}(72)78\,pm\]
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