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Q.

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

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a

actinoid contraction

b

the redioactive nature of actinoids

c

4f and 5d levels being close in energies

d

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

answer is B.

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Detailed Solution

Minimum or comparable energy gap between 5f,6d and 7s subshell makes electron excitation easier, hence there is a greater range of oxidation states in actinoids.

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