Final answer:
Bromine typically forms an ion with a 1- charge.
Step-by-step explanation:
When atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an atom of the next noble gas in the periodic table. Group 17 elements, including bromine, gain one electron to form anions with a 1- charge. For example, the neutral bromine atom can gain one electron to form an anion with a 1- charge. It has the same number of electrons as atoms of the next noble gas, krypton.