Question

Among lanthanoids and actinoids, which have a higher tendency to form complexes?

Answer 1

1. Lanthanoids form complexes only with some chelating ligands and do not easily form complexes with π-bonding ligands.
2. Actinoids can form complexes even with π-bonding ligands due to the availability of 5f orbitals for bonding.
3. Lanthanoids have large ionic sizes and lack suitable orbitals for covalent bonding, reducing their complex-forming ability.
4. Actinoids exhibit multiple oxidation states, enhancing their ability to form various complexes.

Thus, actinoids have a much greater tendency to form complexes than lanthanoids.