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