Across
- 4. Emission or transmission of energy in the form of waves or particles.
- 5. Beam of electrons produced from a cathode ray tube.
- 9. The basic unit of a chemical element.
- 10. Positively charged particle in the nucleus of an atom.
- 11. Negatively charged particle surrounding the nucleus.
- 12. Discovered the neutron.
- 13. Particle with no charge in the nucleus of an atom.
Down
- 1. Discovered the nucleus and the proton.
- 2. Vaccuum tube used to produce cathode rays.
- 3. Credited with having the first modern theory of the atom.
- 6. Discovered the electron.
- 7. Philosopher often credited with first describing the atom.
- 8. Philosopher that believed matter was made up of forms and the elements.