Ionic crystal

They are solids consisting of ions bound together by their electrostatic attraction into a regular lattice.

The properties of NaCl reflect the strong interactions that exist between the ions.

It is a good conductor of electricity when molten, but very poor in the solid state.

When fused the mobile ions carry charge through the liquid.

[2] They are characterized by strong absorption of infrared radiation and have planes along which they cleave easily.

Sodium chloride ( halite ) crystal structure. Each atom has six nearest neighbors, with octahedral geometry . This arrangement is known as cubic close packed (ccp).
Na +
Cl −