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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.
Determine each atom's electronegativity from the table. You can determine a non polar molecule immediately if the molecules have equal electronegativity. A molecule can also be non polar if the structure of the atoms line up in a way that the outer orbital electrons cancel out electronegativity. Therefore, you need to examine the shape of the molecule. In general, V-shaped and pyramid-shaped molecules are polar. Water is polar because of the differences in the electronegativity between oxygen and hydrogen. Oxygen is highly negative compared to hydrogen.