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There are 35 protons and 35 electrons in the elementary Bromine, Br

The number of neutrons however depends on the isotope mass number of Bromine:

There are two stable natural occurring isotopes Br-79(50.5%) and Br-81 (49.5%)

To know the number of neutrons one should substract the atom number (35) from the mass number and you'll find the number of neutrons being 44 and 46, because 35 protons with 44 (or 46) neutrons gives you the mass number 79 (or 81)

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