Lithium, 3, Hydrogen, 1, Helium, 2, Beryllium, 4, Boron, 5, Carbon, 6, Nitrogen, 7, Oxygen, 8, Flurine, 9, Neon, 10, Sodium, 11, Magnesssium, 12, Aluminium, 13, Silicon, 14, Phosphrous, 15, Sulphar, 16, Chlorine, 17, Argon, 18, Potasium, 19, Calcium, 20

Elements and Atomic number

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