20 elements of periodic table with diagrams
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hydrogen
helium
lithium
berrilium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminium
silicon
phosphorous
sulphur
chlorine
argon
potassium
calcium
helium
lithium
berrilium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminium
silicon
phosphorous
sulphur
chlorine
argon
potassium
calcium
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