Write the properties of ionic crystals.

Explanation

In ionic crystals, the units occupying lattice point are positive and negative ions.
The ionic crystals have the following characteristics `:`
(i) The heat of vaporisation is high.
(ii) The vapour pressure of ionic crystals at ordinary temperature are very low.
(iii) Their melting and boiling points are very high.
(iv) They are hard and brittle.
(v) They are insulators in the solid state.
(vi) Ionic crystals are soluble in water and also in other polar solvents.
(vii) Ionic solids are good conductors when dissolved in water.