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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.
This means that the molecule now has a slightly positive top and a slightly negative bottom, and so is overall a polar molecule. A polar molecule will need to be lop-sided in some way. Patterns of electronegativity in the Periodic Table. The most electronegative element is fluorine.