# The lanthanide contraction is responsible for the fact that Option 1)  $Zr$  and $Y$ have about the same radius Option 2)  $Zr$ and $Nb$ have similar oxidation state Option 3)  $Zr$  and $Hf$ have about the same radius Option 4) $Zr$ and $Zn$ have the same oxidation state

D Divya Saini

As we learnt in

Lanthanoid contraction -

The filling of if orbits before 5d orbits result regular decrease in atomic radii called Lanthanoid contraction or can say the size of radii not much increase.

- wherein

$e.g.\:\:\:\:3d\rightarrow 4d\rightarrow 5d$

Due to Lanthanoid contraction size of 5d-series elements is smaller than 4d-series element, that's why Zr and Hf have almost same atomic radii.

Option 1)

$Zr$  and $Y$ have about the same radius

This option is incorrect

Option 2)

$Zr$ and $Nb$ have similar oxidation state

This option is incorrect

Option 3)

$Zr$  and $Hf$ have about the same radius

This option is correct

Option 4)

$Zr$ and $Zn$ have the same oxidation state

This option is incorrect

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