* Solid State: In their solid state, ionic compounds have a rigid, crystalline structure. The ions are held tightly in a fixed position by strong electrostatic forces. This prevents the free movement of charged particles, so they cannot conduct electricity.

* Dissolved or Melted State: When dissolved in water or melted, the ionic bonds break, and the ions become free to move. This creates a mobile pool of charged particles that can carry an electric current. The movement of these ions allows for the flow of electricity.

In summary:

* Solid ionic compounds: Do not conduct electricity.

* Dissolved or molten ionic compounds: Conduct electricity.

Example: Table salt (NaCl) is an ionic compound. It does not conduct electricity in its solid form, but it does conduct electricity when dissolved in water or melted.