Question

Explain how Particles moves in solid lead,molten solid,gaseous lead in these three state of matter

Answer 1

Particles maintain their distance and orientation to other particles in the solid state and only vibrate a little in place so the shape and volume of a lead block does not change (much:).
In the liquid state, the particles maintain their distance but not orientation so the shape can change but not volume.
In the gaseous state the particles maintain only a temperature and pressure determined statistical distance from other particles and change orientation to other particles without restraint, so the volume and shape can change.