## Chemistry: A Molecular Approach (3rd Edition)

$[Ar]4s^{2}$$3d^{10}$$4p^{5}$ $[Ar]4s^{2}$$3d^{10}$$4p^{6}$ or $[Kr]$
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.