1. Discovery of the Electron, Models, and Theories. Andrew, Anthony, Cody

2. JJ Thompson Born 1856, England; Died 1940 (age 83) Won Nobel Prize (1906) Made great inquirers about the atom’s smaller particles Concluded atoms were divisible based on his work

3. JJ Thomson  Experiments dealt with cathode rays  Biggest parts in discovering the electron  Link to more on his experiment  Thomson's Experiment Thomson's Experiment

4. Thomson’s Model

5. Robert Millikan  Born 1868, Illinois; Died 1953 (age 85)  Won Nobel Prize (1923)  Discovered charge of electron  Oil-drop experiment

6. Robert Millikan  Weight-to-charge ratio

7. Niels Bohr  Born in 1885, Denmark; Died 1962 (age 77)  Won Nobel Prize(1922)  Did work on quantum theory  Made model of atom

8. Niels Bohr  Used different theories & structures to create atomic model  Model had electrons orbiting around nucleus

9. Niels Bohr

10. Louis de Broglie  Born 1892, in France; Died 1987 (age 94)  Won Nobel Prize (1929)  Wave nature of electrons  All matter has wave properties

11. Werner Heisenberg  Born 1901, Germany; Died 1976 (age 74)  Won Nobel Prize (1932)  Creator of quantum mechanics  Published paper on model of nucleus

12. Werner Heisenberg

13. Erwin Schrodinger  Born 1887 in Austria; Died 1961 (age 73)  Won Nobel Prize (1933)  Worked on quantum theory  Looked at electron orbit

14. Erwin Schrodinger  Important work on wave mechanics  Made quantum Model

15. Bohr’s Model  Hydrogen only  Electrons orbit around nucleus  Disproved by quantum mechanical

16. Bohr’s Model

17. Quantum Mechanical Model  Made by Schrodinger  Depicts electron movement  Works with all elements

18. Quantum Mechanical Model

19. Cathode Experiment  Thomson's Cathode Ray Experiment Thomson's Cathode Ray Experiment

20. Oil Drop Experiment  http://ffden- 2.phys.uaf.edu/212_fall2003.web.dir/Ryan _McAllister/Slide3.htm http://ffden- 2.phys.uaf.edu/212_fall2003.web.dir/Ryan _McAllister/Slide3.htm

21. Timeline

22. Correct Theories/Models  Bohr’s model  Broglie’s thesis  Schrodinger’s model  Planck’s quantum theory  Heisenberg’s model

23. Incorrect Theories/Models  Thomson’s model  Bohr’s Model