The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

Options

A. the 5f orbitals extend farther from the nucles than 4forbitals.
B. the 5f orbitals are more buried than the 4f orbitals.
C. there is similarity between 4f and 5f orbitals in their angular part of the wave function,
D. the actinoids are more reactive than the lanthanoids.

Answer

A

Explanation

Actnoids exhibits higher oxidation state compared to lanthanoids because 5f orbitals are extended into space beyond 6s and 6p orbitals . The energies of 5f and 6d orbitals s are very close hence they partcipate in bonding while in lanthanoids 4f orbitals are buried deep inside the nucleus totally shielded by outer orbitals and unable to take part in bonding .