Due to the Lanthanide Contraction, the basic character of the lanthanoid trihydroxides () exhibits a — d and f Block Elements Chemistry Question

💡 Solution & Explanation

The ionic radius of $Ln^{3+}$ cations strictly decreases from $La$ to $Lu$. As the cation shrinks, its polarizing power increases, increasing the covalent character of the $Ln-OH$ bond, thereby decreasing its basicity in water.