Mass Number and Atomic Mass are both atomic properties relevant to the discussion revolving around every element that scientists have discovered to date. These properties have everything to do with the rudimentary atomic particles that make up all matter: electrons, protons, neutrons, and other particles beyond the scope of this article.
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References
- https://cdnsciencepub.com/doi/abs/10.1139/p57-114
- https://www.sciencedirect.com/science/article/abs/pii/S0375947403018086