what is the first 20 elements in the periodic table
Hydrogen H, Helium He, Lithium Li, Beryllium Be, Boron B, Carbon C, Nitrogen N, Oxygen O, Fluorine F, Neon Ne, Sodium Na, Magnesium Mg, Aluminium Al, Silicon Si, Phosphorus P, Sulfur S, Chlorine Cl, Argon Ar, Potassium K, Calcium Ca
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