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Travel along our timeline to see a number of important discoveries about the electron and the atom
- Electron discovered by J J Thomson
- Splitting the atom: the new alchemy
Cloud chamber 
- The atom - according to Rutherford and Bohr
- Waves or particles?
- Counting particles
- The neutron
The positron
The first atom smashers
The cyclotron 
- A new kind of radioactivity
- Atom tracks
- Particle physics
New particles
Even bigger machines
Exhibitions On-Line Home Page
© Science Museum and Institute of Physics, 1997. All rights reserved.
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