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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.
Each water molecule is composed of one oxygen atom that is covalently bonded to two hydrogen atoms. The oxygen atom is strongly electronegative as a result of a strong attraction between electrons and the oxygen atom. This attraction is greater than the attraction between electrons and the hydrogen atoms.