Bromine, which has the chemical symbol Br, is found in group 17 of the periodic table. The most common isotope of bromine has a mass number of 79. To calculate the number of neutrons in an atom, you can use the formula:
Number of Neutrons = Mass Number – Atomic Number
Bromine’s atomic number is 35, indicating that it has 35 protons. Therefore, using the mass number of 79:
Number of Neutrons = 79 – 35 = 44
This means that the most common isotope of bromine has 44 neutrons.