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Periodic Table Of Elements

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Hydrogen
number 1 mass 1
Carbon
number 6 mass 12
Nitrogen
number 7 mass 14
Oxygen
number 8 mass 16
Fluorine
number 9 mass 19
Sodium
number 11 mass 23
Magnesium
number 12 mass 24
Phosphorus
number 15 mass 31
Sulfur
number 16 mass 32
Chlorine
number 17 mass 35