Larger number of oxidation states are exhibited by the actinoids then those by the lanthanoids, the main reason being

Options

A. 4 f orbitals more diffused than the 5f orbitals
B. lesser energy difference between 5f and 6d than between 4f and 5d orbitals
C. more energy difference between 5f and 6d than between 4f and 5d orbi ta Is
D. more reactive nature of the actinoids than the lanthanoids

Answer

B

Explanation

Large no. Of oxidation states for actinoids is due to fact that there is very small energy gap between 5f, 6f and 7s orbitals , thus all electrons can take part in bond formation