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 $(Ra)$ | $[Rn] 7s^{2}$ |
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