Which element from following has completely filled f-orbital in observed and expected electronic…

Which element from following has completely filled f-orbital in observed and expected electronic configuration?
  1. Sm
  2. Pr
  3. Lu
  4. Dy

Solution

The observed and expected electronic configuration of $\mathrm{Lu}(\mathrm{Z}=71)$ is $[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^1 6 \mathrm{~s}^2$

Asked in: MHT CET 2024 (10 May Shift 1)

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