Neet PYQ 2007

There is a decrease in the radii of the atoms or ions as one proceeds from $\text{La}$ to $\text{Lu}$.

Lanthanoid contraction is the accumulation of successive shrinkages.

As a result of lanthanoid contraction, the properties of $4d$ series of the transition elements have no similarities with the $5d$ series of elements.

Shielding power of $4f$ electrons is quite weak.