The increase in the atomic radii of the third | vedclass

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(A) The small increase in atomic radii of the $5d$ series elements compared to the $4d$ series is due to the lanthanoid contraction.This phenomenon oc

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$4f$ and $5d$

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(A) The small increase in atomic radii of the $5d$ series elements compared to the $4d$ series is due to the lanthanoid contraction.This phenomenon occurs because the $4f$ orbitals are filled before the $5d$ orbitals.The $4f$ electrons provide poor shielding of the nuclear charge, leading to a greater effective nuclear charge, which pulls the valence electrons closer to the nucleus.Therefore, $X = 4f$ and $Y = 5d$.

The increase in the atomic radii of the third $(5d)$ series of transition elements is very small, which may be accounted for by the filling of '$X$' orbitals before '$Y$' orbitals. $X$ and $Y$ are:

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