Name the first 20 elements in the periodic table.
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helium
lithium
beryllium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminum
silicon
phosphorus
sulphur
chlorine
argon
potassium
calcium
helium
lithium
beryllium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminium
silicon
phosphorus
sulphur
chlorine
argon
potassium
calcium