Question

Actinoids in general show more oxidation states than the langthanoids. The main reason for this is

• A. Higher energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
• B. Lower energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
• C. Higher reactivity of actinoids than lanthanoids
• D. Actinoids are more basic than lanthanoids

Answer 1

Answer: (B)

Lower energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

Answer 2

Due to lesser energy gap between 5f and 6d orbitals a large number of oxidation states are shown by actinoids.