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Chem 331

Chem 331. Chapter 2. History of the Atom. The Greek views around 400 BC Democritus and Epicurus – atoms “uncuttable” Aristotle - 4 elements – earth, wind, fire, water

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Chem 331

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  1. Chem 331 Chapter 2

  2. History of the Atom The Greek views around 400 BC Democritus and Epicurus – atoms “uncuttable” Aristotle - 4 elements – earth, wind, fire, water * All matter is composed of atoms, which are bits of matter too small to be seen. These atoms cannot be further split into smaller portions. * There is a void, which is empty space between atoms. * Atoms are completely solid. * Atoms are homogeneous, with no internal structure. * Atoms are different in size, shape and weight.

  3. John Dalton 1808 “ . . . the ultimate particles of all homogeneous bodies are perfectly alike . . .” Atoms combine in simple ratios.

  4. Avogadro 1811 Gases at the same temperature, pressure, and volume contain the same number of molecules.

  5. Mendeleev and Meyer 1869

  6. Mendeleev’s 1869 Periodic Table

  7. Henri Becquerel and Marie Curie discover radioactivity in 1896

  8. Becquerel’s Serendipity

  9. Curie’s Lab Petit, an assistant Pierre Curie Marie Curie

  10. J J Thompson 1897

  11. Millikan 1909

  12. Rutherford 1911

  13. Gold foil experiment

  14. Moseley 1913

  15. Rutherford 1922 Discovered proton – hydrogen stream after bombarding nitrogen gas with alpha particles Predicted neutron

  16. Rutherford

  17. Chadwick 1932 Read original paper Discovered neutron Irene Curie Joilot

  18. Chadwick 1932

  19. Nuclear model of atom Conference on atom 1911

  20. Spectra Lines Balmer 1885

  21. Other Series 1888 Rydberg manuscript Balmer 1885 series

  22. Max Planck 1900 Blackbody radiation modeled by Introducing quantization of energy

  23. Einstein 1905 Photoelectric effect points to quanta of light - photons

  24. Einstein

  25. Planck and Einstein

  26. Bohr Model of the Atom 1913

  27. Bohr and Einstein

  28. De Broglie 1923

  29. Schrodinger and Heisenberg 1925

  30. The Schrodinger Equation More good times with the Schrodinger equation Great times with quantum mechanics

  31. Orbitals Great website for orbitals

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