We use the term "bond q", represented in symbols as q bond, to refer to the charge di erence between two bonded atoms, or the charge seen across a bond, in an attempt to qualitatively describe the polarity of the bond. We refer to q bond di erence as the absolute value of the di erence between in q bond across di erent partial charge sets. In other words, let B represent the set of all bonds in the molecule. Each atom, u, in the molecule will have a partial charge q(u). Each bond in B will be bound my 2 atoms, u and v. We define the set of all q bond, QB, for a set of partial charges of a molecule as: