When is a molecule polar? Change the electronegativity of atoms in a molecule to see how it affects polarity. See how the molecule behaves in an electric field. Change the bond angle to see how shape affects polarity. Note: The third part of this simluation is not currently available. • Predict bond polarity using electronegativity values. • Indicate polarity with a polar arrow or partial charges. • Rank bonds in order of polarity. • Predict molecular polarity using bond polarity and molecular shape.