The incorrect statement among the following is:

1. Lanthanoids are indeed metallic and conduct heat/electricity.2. Actinoids are very reactive, particularly in powdered form.3. Actinoid contraction is more pronounced due to the even poorer shielding of $5f$ electrons compared to $4f$.4. Incorrect statement: Many trivalent lanthanoid ions (${\text{Ln}}^{3+}$) are colored (except ${\text{La}}^{3+},{\text{Gd}}^{3+}$, and ${\text{Lu}}^{3+}$) due to $f-f$ transitions.