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

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4f and 5d levels being close in energies

the radioactive nature of actinoids

actinoid contraction

5f, 6d and levels having comparable energies

answer is D.

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Detailed Solution

Actinoids have a greater range of oxidation states due to comparable energies of 5f, 6d and 7s orbitals. Hence, all their electrons can take part in bond formation.

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