Q. The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is :
A) lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
B) larger atomic size of actinides than the lanthanides
C) more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
D) greater reactive nature of the actinides than the lanthanides
Explanation
[Solution from source] In actinides the 5f, 6d and 7s levels are closer in energy than 4f, 5d and 6s in lanthanides, so more electrons can take part in bonding, giving more oxidation states. A larger energy gap would do the opposite. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.