first 30 elements atomic mass
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1
1.1.0079
2.4.0026
3.6.941
4.9.0122
5.10.811
6.12.0107
7.14.0067
8.15.9994
9.18.9984
10.20.1797
11.22.9897
12.24.305
13.26.9815
14.28.0855
15.30.9738
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