- Mercury is made of mercury atoms
- Atom is a kind of particle
- Hence, mercury is made of atom particles

- Mercury is made of atom particles
- Particles in a solid are closer together than particles in a liquid
- Mercury changes from liquid state to solid state
- So, mercury atoms move closer together

- Mercury is made of mercury atoms
- Atom is a kind of particle
- So, mercury is made of atom particles

- Mercury is made of atom particles
- Particles in a liquid have more kinetic energy than particles in a solid
- Mercury changes from liquid state to solid state
- Hence, mercury atoms have less kinetic energy

- Mercury atoms move closer together
- Mercury atoms have less kinetic energy
- Therefore, mercury atoms have less kinetic energy and move closer together

Hence, mercury atoms have less kinetic energy and move closer together
As a sample of mercury changes state from liquid to solid, the atoms of the sample
- Mercury is made of mercury atoms 
- Particles in a liquid have more kinetic energy than particles in a solid 
- Particles in a solid are closer together than particles in a liquid 
- Atom is a kind of particle 
- Mercury changes from liquid state to solid state