Hydrogen
[1]
Helium
[2]
Lithium
[2,1]
Beryllium
[2,2]
Boron
[2,3]
Carbon
[2,4]
Nitrogen
[2,5]
Oxygen
[2,6]
Fluorine
[2,7]
Neon
[2,8]
Sodium
[2,8,1]
Magnesium
[2,8,2]
Aluminium
[2,8,3]
Silicon
[2,8,4]
Phosphorus
[2,8,5]
Sulfur
[2,8,6]
Chlorine
[2,8,7]
Argon
[2,8,8]
Potassium
[2,8,8,1]
Calcium
[2,8,8,2]