01 - Hydrogen, 02 - Helium, 03 - Lithium, 04 - Beryllium, 05 - Boron, 06 - Carbon, 07 - Nitrogen, 08 - oxygen, 09 - Fluorine, 10 - Neon, 11 - Sodium, 12 - Magnesium, 13 - Aluminum, 14 - Silicon, 15 - Phosphorus, 16 - Sulfur, 17 - Chlorine, 18 - Argon, 19 - Potassium, 20 - Calcium,

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