Answer
$[Ar]4s^{2}$$3d^{10}$$4p^{5}$
$[Ar]4s^{2}$$3d^{10}$$4p^{6}$ or $[Kr]$
Work Step by Step
Write the electron configuration for an uncharged Br atom. One electron must be added to Br to form the ion $Br^{-}$. Add this electrons to its energy level and change the corresponding electron configuration.