According to X-ray studies Ionic compounds not exist in form of independent molecules but exist in form of ions in crystalline solids. These ions are arranged like to form the crystal lattice in definite geometric pattern.Example, in NaCl crystal, each Na+ ion is surrounded by six Cl- ions and each Cl- ion is surrounded by six Na+ ions. The geometric arrangement of different ionic compounds depending upon the size and the magnitude of the charges on the ions.
Ionic compounds are usually soluble in water & other polar solvents having high dielectric constants. This is due to larger electrostatic interactions between polar solvents & ions. Ionic compounds are insoluble in non-polar solvent.
The ionic compounds split up in to oppositely charged ions when dissolved in water. The chemical reactions of ionic compounds are characteristic of the ions and are known as 'ionic reactions'. Such reactions occur instantaneously.
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