* Ionic Nature: Sodium hydride is an ionic compound. This means it's formed by the electrostatic attraction between positively charged sodium ions (Na+) and negatively charged hydride ions (H-).
* Melting Point: When NaH melts, the strong electrostatic forces holding the ions together in the solid lattice weaken. This allows the ions to move freely within the molten liquid.
* Ion Mobility: The free movement of Na+ and H- ions in the molten state enables the conduction of electricity. When an electric field is applied, these ions migrate towards the oppositely charged electrodes, carrying the electric current.
Important Note: Solid NaH is a poor conductor of electricity because the ions are fixed in the crystal lattice and cannot move freely.
In summary, the conductivity of molten NaH arises from the presence of mobile ions that can carry an electric charge under the influence of an electric field.
