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Hydrogen, H
Atomic number 1
Helium, He
Atomic Number 2
Lithium, Li
Atomic Number 3
Beryllium, Be
Atomic Number 4
Boron, B
Atomic Number 5
Carbon, C
Atomic number 6
Nitrogen, N
Atomic Number 7
Oxygen, O
Atomic Number 8
Fluorine, F
Atomic Number 9
Neon, Ne
Atomic Number 10
Sodium, Na
Atomic Number 11
Magnesium, Mg
Atomic Number 12
Aluminium, Al
Atomic Number 13
Silicon, Si
Atomic Number 14
Phosphorus, P
Atomic number 15
Sulphur, S
Atomic number 16
Chlorine, Cl
Atomic number 17
Argon, Ar
Atomic number 18
Potassium, K
Atomic number 19
Calcium, Ca
Atomic number 20