Which among the following elements has only one electron in valence shell?

Which among the following elements has only one electron in valence shell?
  1. $\mathrm{Ca}$
  2. $\mathrm{Ra}$
  3. $\mathrm{Rb}$
  4. $\mathrm{Ba}$

Solution

I A group elements have $1 \mathrm{e}^{-}$in valence shell

Asked in: MHT CET 2022 (06 Aug Shift 2)

Practice more Classification of Elements and Periodicity in Properties questions on Aicharya