The actinoids exhibits more number of oxidation states in general than the lanthanoids. This 1s because:

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the 5f-orbitals are more buried than the 4f-orbitals

there is a similarity between 4f and 5f in their angular part of the wave function

the actinoids are more reactive than the lanthanoids

the 5f-orbitals extend further from the nucleus than the 4f-orbitals

answer is D.

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Detailed Solution

In general, the actinoids display a greater variety of oxidation states than the lanthanoids. This is due to the fact that the 4f-orbitals are closer to the nucleus than the 5f-orbitals are.

The 5f orbitals reach the nucleus further than the 4f orbitals. More buried than the 4f orbitals are the 5f orbitals. The angular portion of the wave function has similarities between the 4f and 5f orbitals. Lanthanoids are less reactive than actinoids.

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