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It is not the interaction between ions and dipoles that determine the phase, but the size of the atom/molecule. For example, fluorine gas, F2, is a gas at room temperature, while diiodine, I2, is a solid at room temperature. F2 has 9 electrons while I2 has 53 electrons. This means that the instantaneous dipole that froms in I2 is stronger than that of F2. The induced dipole-induced dipole interaction between I2 molecules are, therefore, stronger than those of F2.
The intermolecular forces between molecules are what determine the state of something. Generally, the stronger the intermolecular forces, the more likely something will be a solid at room temperature or have a higher boiling point.
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