Question

a piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering which characteristic of the particles of matter is illustrated by these observations​

Answer 1

The intermolecular force of attraction is illustrated by the above observation. Particles of matter attract each other and it is different for different materials.

Answer 2

Particles of matter attract each other

Bcz of the more attraction btw iron prticles it cannot break easily