Figure 10. Three dimensional structure of a water molecule. Water is a polar molecule, due to an uneven distribution of electron density. The oxygen in water has a partial negative charge (δ-) due the unequal sharing between the pairs of electrons of oxygen and hydrogen, with oxygen holding the shared electrons more than the hydrogen. In contrast, hydrogen has a partial positive charges (δ+). These partial charges within a water molecule are responsible for hydrogen bonding between water molecules and other molecules, as well.
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