Hydrogen, 1, Helium, 2, Lithium, (2,1), Beryllium, (2,2), Boron, (2,3), Carbon, (2,4), Nitrogen, (2,5), Oxygen, (2,6), Flurine, (2,7), Neon, (2.8), Sodium, (2,8,1), Magnesium, (2,8,2), Aluminum, (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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