# What causes dipole moment?

An example of a molecule with a dipole moment is water, or ${H}_{2} O$. The positive charges are on the hydrogen atoms, anf denoted by the symbol ${\delta}^{+}$, and the negative charge is on the oxygen atom, ${O}_{2}$, and denoted by the symbol ${\delta}^{2 -}$, because the oxygen atom has a charge of -2.