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The reason for greater range of oxidation states in actinides is attributed to

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actinide contraction

5f, 6d and 7s sub levels have comparable energies

the radioactive nature of actinoides

4f and 5d levels being close in energies

answer is B.

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Actinoid shows greater range of oxidation state as 5f, 6d, 7s levels have comparable energies.

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