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Ionic bonds are classified as bonds similarly to covalent bonds meaning that they are intramolecular forces. When two oppositely charged ions interact, they form a bond and become one molecule so the attractive force is within that molecule rather than between two (hence, it is intramolecular). Conversely, when two polar molecules interact, dipole-dipole forces connect them. Dipole-dipole forces (and hydrogen bonds) are not bonds so they are considered intermolecular forces rather than intramolecular forces.
Intramolecular forces are the forces that hold atoms together within a molecule (covalent, ionic bonds). Intermolecular forces are forces that exist between molecules (dipole-dipole, hydrogen bonding, London dispersion interactions).
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