Alkaline earth metal

4

Be

9.0122 u

[He] 2s2

Beryllium

Alkaline earth metal

12

Mg

24.3059 u

[Ne] 3s2

Magnesium

Alkaline earth metal

20

Ca

40.078 u

[Ar] 4s2

Calcium

Alkaline earth metal

38

Sr

87.62 u

[Kr] 5s2

Strontium

Alkaline earth metal

56

Ba

137.327 u

[Xe] 6s2

Barium

Alkaline earth metal

88

Ra

226 u

[Rn] 7s2

Radium

Alkaline earth metal