Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being

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More energy difference between 5f and 6d than between 4f and 5d orbitals

Lesser energy difference between 5f and 6d than between 4f and 5d orbitals

More reactive nature of the actinoids than the lanthanoids.

4f orbitals more diffused than the 5f orbitals

answer is C.

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Detailed Solution

We know that Actinides show larger oxidation states than lanthanides, because of the small energy gap between 5f, 6d and 7s subshells. Hence, the outermost electrons get easily excited to the higher energy levels, giving variable oxidation states..

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