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Question:

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

5f, 6d and 7s levels having comparable energies.

4f and 5d levels being close in energies.

the radioactive nature of actinoids.

actinoid contraction.

Solution:

The reason for greater range of oxidation states in actinoids is attributed to 5f, 6d and 7s levels having comparable energies. The oxidation states range from +2 to +7. The most common oxidation state is +3. Hence, option D is correct.