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

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

4f orbitals more diffused than the 5f orbitals

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

more reactive nature of the actinoids than the lanthanoids

answer is B.

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Being lesser energy difference between 5f and 6d than 4f and 5d orbitals.

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