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What are crystals?
Assertion ( A) : Graphite is a good conductor of electricity. However diamond belongs to the category of insulators. Reason ( R ) : Graphite is soft in nature on the other hand diamond is very hard and brittle.
The ionic crystals are not usually _____ .
Ionic radii are
In NaCl ionic crystal each Na^+ ion is surrounded by -------- Cl^- ions and each Cl^- ion is surrounded by -------- Na^+ ions.
