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Nov 16, 2013 · If the difference is 1.7 or less then the bond is said to be covalent; however, Difference in electronegativity covalent bonds can be classified as nonpolar covalent bonds Ionic 3.3 to > 1.7 (with electronegative Polar differences of 0 to 0.3) or Covalent 1.7 to > .3 polar covalent bonds (with Covalant .3 to 0 electronegativity differences ... One can determine the polarity of AlBr3 by first drawing a simple Lewis structure. We know that Aluminum has three (3) valence electrons and Bromine has seven (7) valence electrons. Using the periodic table, predict whether the following chlorides are ionic or covalent: KCl, NCl 3, ICl, MgCl 2, PCl 5, and CCl 4. Using the periodic table, predict whether the following chlorides are ionic or covalent: SiCl 4, PCl 3, CaCl 2, CsCl, CuCl 2, and CrCl 3. For each of the following compounds, state whether it is ionic or covalent.