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Actinides have higher tendency to form complexes than Lanthanides, due to

1. Higher charge and smaller size
2. Smaller charge and larger size
3. They are radioactive
4. They are electropositive

Correct answer: Higher charge and smaller size

Solution

Actinide ions generally have higher charge and smaller ionic radii than lanthanide ions, giving them greater charge density. This makes them more polarizing and better able to form complexes with ligands.

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