what is the total number of protons and neutrons in br
Best Answer: All Br atoms have 35 protons (the atomic number of Br). Since 81 is the mass number (sum of protons + neutrons), this atom has 81-35 = 46 neutrons. An uncharged atom of bromine will have the same number of electrons as protons. Since this atom has a -1 charge, it has one additional electron. So, it has 36 electrons.