5A. Particles in a solid are closer/farther apart than they are in a liquid or gas which are closer/farther apart.
5B. Conduction involves the collision of particles in less/more dense
materials collide less/more often than particles in less/more dense
materials. For example, solids conduct thermal energy faster/slower
than liquids or gases because the particles are closer or farther apart
and collide frequentiylrarely.

See below

Explanation:

5A   Particles in a solid are CLOSER than they are in a liquid or a gas which are farther apart.

5B   Conduction involves the collision of particles in MORE dense materials collide MORE often than particles in LESS dense materials.  For example, solids conduct thermal energy FASTER than liquids or gases because the particles are CLOSER and collide FREQUENTLY.

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