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
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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