Which among the following elements do not have any electron in $\mathrm{f}-$ sub shell either in expected or…

Which among the following elements do not have any electron in $\mathrm{f}-$ sub shell either in expected or in observed state electronic configuration?
  1. $\mathrm{Lu}(\mathrm{Z}=71)$
  2. $\mathrm{La}(\mathrm{Z}=57)$
  3. $\mathrm{Eu}(\mathrm{Z}=63)$
  4. $\mathrm{Nd}(\mathrm{Z}=60)$

Solution

$\begin{aligned} & \mathrm{La}=[\mathrm{Xe}] 5 \mathrm{~d}^1 6 \mathrm{~s}^2 \\ & \mathrm{Z}=57\end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 2)

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