atomic mass of elements from 1 to20 in qwhole numbers
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1 - 1
2-4
3-7
4-9
5-11
6-12
7-14
8-16
9-19
10-20
11-23
12-24
13-27
14-28
15-31
16-32
17-35,37
18-40
19-39
20-40
Hope it's usefull
chicken55:
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