Question

name the solids which are hard and brittle

Answer 1

diamond should be the correct answer

Answer 2

They are brittle because of low mobility of defects called dislocations present in ionic solids.

We all know that metals are ductile and they deform plastically. This is because of the movement of dislocations on certain crystallographic planes of metals. In contrast, ionic solids don’t deform plastically. This is because of low mobility of dislocations present in ionic solids. The low mobility comes from the fact that it is difficult to break an ionic bond for a dislocation to move. The high mobility of dislocations present in metals comes from the fact that it is easy to break a metallic bond to move a dislocation

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