Hydrogen - 1, Helium - 2, Lithium - 3, Beryllium - 4, Boron - 5, Carbon - 6, Nitrogen - 7, Oxygen - 8, Fluorine - 9, Neon - 10, Sodium - 11, Magnesium - 12, Aluminium - 13, Silicon - 14, Phosphorus - 15, Sulfur - 16, Chlorine - 17, Argon - 18, Potassium - 19, Calcium - 20,

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