* Atomic Number: 35

* Atomic Mass: 79.904 amu (atomic mass units)

Explanation:

* Atomic Number: This represents the number of protons in the nucleus of an atom. Since the number of protons defines an element, all bromine atoms have 35 protons.

* Atomic Mass: This is the average mass of all naturally occurring isotopes of an element. Bromine has two main isotopes, bromine-79 and bromine-81, which is why the atomic mass is not a whole number.