Q. The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because
A) The $5f$-orbitals are more buried than the $4f$-orbitals.
B) There is a similarity between $4f\$and $5f$-orbitals in their angular part of the wave function.
C) The actinoids are more reactive than the lanthanoids.
D) The $5f$-orbitals extend further from the nucleus than the $4f$ -orbitals.
Explanation
(d)
The actinoids (5$f$-elements) exhibits more number of oxidation states in general than the lanthanoid because 5$f$-orbitals extend farther from the nucleus than the 4$f$-orbitals.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.