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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.
They are partial charges, making the water molecule polar. This occurs because the oxygen atom is more electronegative than the hydrogen atoms, and therefore holds the electroâ¦ns more tightly than the hydrogen atoms. This gives the oxygen atom a partial negative charge and the hydrogen atoms a partial positive charge.