There are 3 lone pairs on all the three bromine atom. Tribromide is the anion with the chemical formula br 3−, or salts containing it: Br3⁻ is nonpolar despite its polar bond characteristics because its linear geometry allows dipole moments to cancel each other out.
One bromine atom shares a bond with. Share it on facebook twitter email. Sodium and potassium tribromides can be prepared by reacting nabr or kbr with aqueous bromine.
The molecular geometry of the br3 lewis structure is trigonal planar. In br−3, total number of valence electrons =7(3)+1=22. In fact, tribromide ion has the generic formula axx2ex3 a x x 2 e x 3 according to lewis diagram. In this the center br has expanded octet.
Draw an electron dot structure for br−3. Where a a is the central atom, x x an atom bonded to a a and e e a lone pair. Valence shell electron pair repulsion (vsepr) theory: There are 2 single bonds between each bromine atom (br).