The electronic configuration of actinides cannot be assigned with degree of certainty because of :

overlapping of inner orbitals.

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free movement of electrons over all the orbitals.

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small energy difference between 5f and 6d levels.

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none of the above.

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Solution

The correct option is C small energy difference between 5f and 6d levels.
As energy difference between 5f, 6d and because of that electronic configuration of actinides cannot be assigned with degree of certainty.

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