Give reasons: Actinoids show irregularities in their electronic configurations.
Actinoids show irregularities in their electronic configurations because the energy differences between 5f, 6d and 7s subshells are very small; hence, an electron can be occupied in any of the subshells. They have the electronic configuration of 7s2 with variation of occupancy in 5f and 6d orbitals.
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- F-block Elements - The Actinoids