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