Which of the following lanthanoids have [Xe] 4 f^x 5 ~d ^1 6 ~s ^2 configuration in their ground state? (x=1-14)

Step-by-step solution

Ce , Gd and Lu have [ Xe ] 4 f ^ x 5 ~d ^1 6 ~s ^2 configuration. aligned Ce & =[ Xe ] 4 f ^1 5 ~d ^1 6 ~s ^2 Gd & =[ Xe ] 4 f ^7 5 ~d ^1 6 ~s ^2 Lu & =[ Xe ] 4 f ¹⁴ 5 ~d ^1 6 ~s ^2 aligned