What is the electronic configuration of third element of group-2 in periodic table?

What is the electronic configuration of third element of group-2 in periodic table?
  1. $[\mathrm{Ne}] 3 \mathrm{~S}^{1}$
  2. $[\mathrm{Ne}] 3 \mathrm{~S}^{2}$
  3. $[\mathrm{Ar}] 4 \mathrm{~S}^{1}$
  4. $[\mathrm{Ar}] 4 \mathrm{~S}^{2}$

Solution

Third element of group 2 is calcium- Ca. atomic number 20 electronic configuration: [Ar] 4s2

Asked in: MHT CET 2020 (14 Oct Shift 2)

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