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A water molecule is held together by two single polar covalent bonds. 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with two partial negative charges near the oxygen atom and one partial positive charge near each hydrogen atom. 3. Atoms differ in their affinity for neutrons, a property called electronegativity.
Fluorine is the most electronegative element. It has a charge of -1 and readily forms compounds. Original author unknown, Creative Commons License (Wikipedia). Anne Marie Helmenstine, Ph.D.ther highly electronegative elements are oxygen and chlorine. The element hydrogen does not have as high of an electronegativity because, although it has a half-filled shell, it readily loses an electron rather than gains one.