What are the 20 elements and their symbols?
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hydrogen. H
Helium. He
lithium. Li
beryllium Be
Baron. B
carbon C
nitrogen. N
oxygen. O
fluorine. Fe
neon. Ne
sodium. Na
magnesium. Mg
aluminium. Al
silicon. Si
phosphorus. P
Sulphur. S
chlorine. Cl
argon. Ar
potassium. k
calcium. Ca
Helium. He
lithium. Li
beryllium Be
Baron. B
carbon C
nitrogen. N
oxygen. O
fluorine. Fe
neon. Ne
sodium. Na
magnesium. Mg
aluminium. Al
silicon. Si
phosphorus. P
Sulphur. S
chlorine. Cl
argon. Ar
potassium. k
calcium. Ca
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