More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

Options

A. more active nature of the actinoids
B. more energy difference between 5d and 6d orbitals than that between 4f and 5d orbitals
C. lesser energy difference between 5d and 6d orbitals than that between 4f and 5d orbitals
D. greater metallic character of the lanthanoids than that of the corresponding actioids

Answer

C

Explanation

There is a greature range of oxidation states exhibited by actinoids, which is in part attributed to the fact that the 5f, 6d and 7s levels are of comparable energies.