Write the symbol and name of the elements and atomic number for first 20 elements
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Hydrogen H
Helium. He
Lithium Li
Beryllium Be
Boron B
Carbon C
Nitrogen. N
Oxygen O
Fluorine Fe
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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