Question

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

• (A) The 5f orbitals extend further from the nucleus than the 4f orbitals
• (B) The 5f orbitals are more buried than the 4f orbitals
• (C) There is a similarity between 4f and 5f orbitals in their angular part of the wave function.
• (D) The actinoids are more reactive than lanthanoids

Answer 1

The Correct Option is A

Explanation:
shielding effect of 5f < shielding effect of 4f so Zeff (z effect) in actinoidis < Zeff (z effect) in lanthanoid so extraction of electrons in actinoid is easy than lanthanoid which has 4f and better shielding