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Dipoles usually result from a great charge difference between the two ions. One would be partially negative and the other positive, one of the examples from the top of my head would be water I think. You can read more about it in the textbook, for me in the 6th edition it was around page 92.
Ion-dipole forces can be generated between polar water molecules and a sodium ion. The oxygen atom in the water molecule has a slight negative charge and is attracted to the positive sodium ion. These intermolecular ion-dipole forces are much weaker than covalent or ionic bonds.
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