D And F Block Elements

$\operatorname{Ln}$ (III) compounds are predominantly ionic in character.

$\operatorname{Ln}$ (III) compounds are generally colourless.

$\operatorname{Ln}$ (III) hydroxides are mainly basic in nature.

The inoic size of $\operatorname{Ln}(I I I)$ ions decreases with increasing atomic number.