Question

A piece of chalk can be broken in small particles by hammering but piece of iron cannot be broken into smaller particles by hammering. Which characteristic of particles of matter is illustrated by this observation

Answer 1

the characteristic illustrated in this case is that the particles of matter attract each other. a chalk can be broken upon hammering because its forces of attraction are not as strong as compared to a piece of iron.
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Answer 2

This illustration shows the force of attraction between the chalk and iron.

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