Zr (Z=40) and Hf (Z=72) have similar atomic a | vedclass

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(C) The atomic and ionic radii of $Zr$ $(Z=40)$ and $Hf$ $(Z=72)$ are very similar.This phenomenon is known as the lanthanoid contraction.As we move f

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lanthanoid contraction

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(C) The atomic and ionic radii of $Zr$ $(Z=40)$ and $Hf$ $(Z=72)$ are very similar.This phenomenon is known as the lanthanoid contraction.As we move from $4d$ series to $5d$ series elements in the same group,the filling of $4f$ orbitals occurs.The poor shielding effect of $4f$ electrons leads to a decrease in atomic size,which almost perfectly compensates for the expected increase in size due to the addition of a new shell.

$Zr$ $(Z=40)$ and $Hf$ $(Z=72)$ have similar atomic and ionic radii because of :

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