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20 terms

exact atomic masses 1-30

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1
Hydrogen H 1.00794
2
Helium He 4.002602
3
Lithium Li 6.941
4
Beryllium Be 9.012182
5
Boron B 10.811
6
Carbon C 12.0107
7
Nitrogen N 14.00674
8
Oxygen O 15.9994
9
Fluorine F 18.9984032
10
Neon Ne 20.1797
11
Sodium Na 22.989770
12
Magnesium Mg 24.3050
13
Aluminum Al 26.981538
14
Silicon Si 28.0855
15
Phosphorous P 30.973961
16
Sulfur S 32.066
17
Chlorine Cl 35.4527
18
Argon Ar 39.948
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Potassium K 39.0983
20
Calcium Ca 40.078