alleryStart learning →The general outer configuration of lanthanoids is
A[Xe] 4f0-14 5d0-2 6s2
B[Ar] 3d1-10 4s2
C[Rn] 5f0-14 6d0-2 7s2
D[Kr] 4d1-10 5s2
Answer & Solution
Correct answer: A. [Xe] 4f0-14 5d0-2 6s2
Lanthanoids fill 4f after the xenon core, with two electrons in 6s.
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