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sukhopar [10]
3 years ago
5

The atomic mass of an atom can be found by

Chemistry
1 answer:
sashaice [31]3 years ago
8 0
The answer to this question is A
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1. Lanthanum-139 atom is the stable isotope of lanthanum with relative atomic mass 138.906348, 99.9 atom percent natural abundance and nuclear spin 7/2.

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