The physical properties of melting point and boiling point, for example, are related to the strength of attractive forces between molecules. These attractive forces are called Intermolecular Forces.In an ionic bonding, there is an ionic force. This force is commonly called electrostatic force (Coulomb).
Each Na+ ion and Cl- ion attracts one of another, so that they forms a Crystal.
Although there is a repulsion between inner electrons of Na+ and outer electrons of Cl-, the ionic force is much stronger than the repulsion.
The ionic force is much stronger than the molecular force, so boiling point and melting point of ionic compounds are higher than covalent compounds. The last force will be discussed later.
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