Question

How many protons does an atom of bromine have ?

Answer 1

Each atom of bromine has 35 protons and this is bromine's atomic number. <span />

Answer 2

In $^A_ZX$, $Z$ is the number of protons.
And we have : $_{35}Br$, so $Z=35$.

So there are 35 protons in the bromine.