Question

The atomic number of bromine (Br) is 35
and its atomic mass is 79.904. What is the
mass number of Br?​

Answer 1

Answer:

we know that mass number is sum of nucleons.

That is the sum of neutrons and protons.

bromine has 45 neutron and 35 protons

so 45 + 35 = 80

the mass number of bromine is 80.