Bromine, with atomic mass 79.942 u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is:

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Nuclear physics is a field of physics that studies the structure of atomic nuclei, their interactions, and their constituents. It also studies other forms of nuclear matter.


Bromine, with atomic mass 79.942 u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is: