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

  • A
    $[Ne] 3s^1$
  • B
    $[Ne] 3s^2$
  • C
    $[Ar] 4s^1$
  • D
    $[Ar] 4s^2$

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$(i)$ $ns^2 np^4$ where $n = 3$
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