Out of solid, liquid or gas, which one has the maximum movement of particles?

Out of solid, liquid or gas, which one has maximum inter-particle forces of attraction.

Out of solid, liquid or gas, which one has minimum spaces in between constituent particles?

Why do gases have neither a fixed shape nor a fixed volume?

Why are gases easily compressible while it is almost impossible to compress a solid or a liquid?

How will you justify that ice, water and steam are the three states of a substance and not different substances?

Why does a gas fill a vessel completely?

State four properties of solids.