The electronic configuration of actinides Cannot be assigned with degree of certainty because of

Options

A. overlapping of inner orbirtals
B. small energy difference between 5f and 6d orbitals
C. free movement of electrons over all the orbitals
D. all of these

Answer

B

Explanation

We know that , 5f and 6d orbitals has almost equal energy. Three are some uncertainties regarding the filling of 5f and 6d orbitals. The electron may enter either 5f or 6d lebitals. Hence electronic configuration of actinides known with uncertainties.