Electron arrangements of the first 20 elements
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)
Sulphur (2, 8, 6)
Chlorine (2, 8, 7)
Argon (2, 8, 8)
Potassium (2, 8, 8, 1)
Calcium (2, 8, 8, 2)
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