Write down the general electronic configuration of alkaline earth metals and give the electronic configuration of all elements of this group.

Alkaline earth metals have two electrons in the $s$-orbital of the valence shell. Their general electronic configuration is represented as $[Noble \ gas] ns^{2}$.

Element	Electronic configuration
Beryllium $(Be)$	$1s^{2} 2s^{2}$
Magnesium $(Mg)$	$[Ne] 3s^{2}$
Calcium $(Ca)$	$[Ar] 4s^{2}$
Strontium $(Sr)$	$[Kr] 5s^{2}$
Barium $(Ba)$	$[Xe] 6s^{2}$
Radium $(Ra)$	$[Rn] 7s^{2}$