The molecule [tex]Br_2[/tex] has a covalent bond and comes from the bromide ion, [tex]Br^{-}[/tex]. Each ion has 7 valence electrons to bring to the Lewis structure . Each [tex]Br^{-}[/tex] interacts with eight valence electrons, six as lone pair and 2 as a shared pair. This means the are 14 electrons available to build the Lewis dot structure.
