Reported Question / Answer
Ionic crystals are highly brittle bcuz solids are composed of parallel layers which contains cations and anions in alternate positions,so that the opposite ions in the various parallel layers lie over each other.when an external force is applied ,one layer of the ions slides a bit over the other layer along a plane.in this way the like ions come in front of each other and hence repel.so,the application of a little external force develops repulsion between two layers causing bitterness.
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