# How many electrons are there in a neutral atom of Kr-85?

For $\text{krypton}$, $Z = 36$. By definition, this means that there are 36 positively charged particles in the krypton nucleus. Since it is the ""^85Kr isotope, this also means that there are $85 - 36 = 49$ neutrons in this nuclide but this is not germane to the problem.