List of elements by atomic number and mass
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hydrogen 1
helium 2
lithium 3
beryllium 4
boron 5
carbon 6
nitrogen 7
oxgen 8
fluorine 9
neon 10
sodium 11
magnesium 12
aluminium 13
silicon 14
phosphorus 15
sulphur 16
chlorine 17
argon 18
pottasium 19
calcium 20
helium 2
lithium 3
beryllium 4
boron 5
carbon 6
nitrogen 7
oxgen 8
fluorine 9
neon 10
sodium 11
magnesium 12
aluminium 13
silicon 14
phosphorus 15
sulphur 16
chlorine 17
argon 18
pottasium 19
calcium 20
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