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

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the radioactive nature of actinoids

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

4f and 5d levels being close in energies

actinoid contraction

answer is D.

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Detailed Solution

5f,6d and 7s levels having comparable energies ,electrons of 5f,6d and 7s electrons participate in bonding.

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