Question

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because
A. The actinoids are more reactive than the lanthanoids
B. The `5f` orbitals exhibit farther from the lanthanoids.
C. The `5f` orbital are more buried than `4f` orbitals
D. There is a similarity between `4f` and `5f` orbitals in their angular part of the wave function

Answer 1

Correct Answer - 2
The distance between the nucleus and `5f` orbital(actinides) is more than the distance between the nucleus and `4f` orvbitals (lanthanides). Hence the hold of nucleus on valence electron decrease in actinides. For this statement-2 the actinoids exhibit more number of oxidation states in general.