Q27 / 150 · MHT CET 2022 (07 Aug Shift 2) · Chemistry

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

  • Correct answer
    A
    $\mathrm{Fr}$
  • B
    Ca
  • C
    Mg
  • D
    $\mathrm{Sr}$

Solution

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

Hence, the correct answer is option: 'A'.

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