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Atomic masses of some important elements

Element       Symbol      Atomic         Atomic 
                                           number          mass

 Hydrogen      H                    1                   1.0079

 Helium          He                  2                     4.0026

 Lithium         Li                   3                       6.941

 Beryllium       Be                 4                    9.0122

 Boron              B                   5                     10.811

 Carbon           C                   6                    12.011       
Nitrogen        N                   7                     14.007

Oxygen           O                   8                     15.999

 Fluorine         F                   9                     18.998

 Neon              Ne                 10                   20.180

 Sodium        Na                  11                   22.990

 Magnesium     Mg             12                   24.305

 Aluminium      Al             13                     26.982

 Silicon               Si             14                     28.086

 Phosphorus      p             15                     30.974

 Sulphur             S             16                    32.065

 Chlorine           Cl            17                    35.453

 Argon                Ar           18                     39.945

 Potassium       K              19                     39.098

 Calcium           Ca            20                    40.078

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