Atomic Theory Crossword

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Across
  1. 2. Discovered the neutron
  2. 5. Experiment that led to the discovery of the atomic nucleus
  3. 9. Concept for electron energy levels in atoms
  4. 11. The central part of an atom, containing protons and neutrons
  5. 12. Discovered the electron using a cathode ray tube
  6. 13. In quantum mechanics, these define the regions where electrons are likely to be found
  7. 15. Schrödinger's theory describes electrons in terms of these functions
  8. 16. A neutral particle in the nucleus, contributing to atomic mass
  9. 17. Discovered the nucleus
  10. 19. A negatively charged particle found in all atoms
  11. 20. A positively charged particle located in the nucleus of an atom
Down
  1. 1. Refers to a simplified representation of atoms
  2. 3. Early Greek philosopher
  3. 4. Basic unit of matter
  4. 6. Formulated the uncertainty principle in quantum mechanics
  5. 7. Thomson's model of the atom describes electrons embedded in a positively charged "pudding"
  6. 8. Proposed the first modern atomic theory in 1803
  7. 10. Developed a model of the atom with quantized energy levels
  8. 14. Proposed the quantum mechanical model of the atom
  9. 18. Heisenberg's principle