Covalent bonds in which the sharing of the electron pair is unequal, with the electrons spending more time around the more nonmetallic atom, are called polar covalent bonds. In such a bond there is a charge separation with one atom being slightly more positive and the other more negative, i.e., the bond will produce a
dipole moment. The ability of an atom to attract electrons in the presense of another atom is a measurable property called
electronegativity.
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