Question

Why nacl is brittle?

Answer 1

The structure of a sodium chloride crystal consists of alternating Na+ and Cl- ions, arranged in a cube. When stress is applied to the cube, instead of the oppositely charged ions being adjacent to one another, same charges are brought into alignnent and repel one another. After stress is applied, the very same electrostatic forces that held the crystal together now cause it to fly apart.
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Answer 2

NaCl is brittle because when it is made from sea water it is in the form of big crystals but when they are used as they are broken into small pieces
we know that brittle means anything which can easily breaks for example brick..etc...