Question

The properties of $Zr$ and $Hf$ are similar because:

• A. Both elements belong to d-block
• B. Both lie on the same group in the periodic table
• C. Both have similar radii
• D. They have the same number of unpaired electrons

Answer 1

The correct option is C Both have similar radii

$Zr$ and $Hf$ exhibit similar properties as they have similar sizes. It is due to lanthanide contraction.
Electrons present in the $f$-subshell does not shield effectively due to which with increase in atomic number, the effective nuclear charge is felt more by the electron and thus the size gets constricted and the size becomes almost equal.