Which among the following elements develops noble gas configuration in +1 state?

Which among the following elements develops noble gas configuration in +1 state?
  1. $\mathrm{Fr}$
  2. Ca
  3. Mg
  4. $\mathrm{Sr}$

Solution

$\begin{aligned} & \text { Fr }=[R n] 7 s^1 \\ & \text { or } \mathrm{Fr}^{+1}=[\mathrm{Rn}]\end{aligned}$

Asked in: MHT CET 2022 (07 Aug Shift 2)

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