distribution of electrons in various
shells for the first eighteen elements.
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Hydrogen. - 1
Helium. - 2
Lethium. - 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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