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Democritus -Greek philosopher 450 BC

Democritus -Greek philosopher 450 BC. Aristotle. -born 384 BC -Greek philosopher, educator & scientist -student of plato. Lavoisier -French chemist 1700’s - “Law of Conservation of Mass”. 2 Mg + O 2 2 MgO . 16.58g. 10.0g. 6.58g. 16.58g. 16.58g. Joseph Proust.

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Democritus -Greek philosopher 450 BC

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  1. Democritus -Greek philosopher 450 BC

  2. Aristotle -born 384 BC -Greek philosopher, educator & scientist -student of plato

  3. Lavoisier -French chemist 1700’s -“Law of Conservation of Mass”

  4. 2 Mg + O2 2 MgO 16.58g 10.0g 6.58g 16.58g 16.58g

  5. Joseph Proust -1754-1826 -French Chemist -Law of Definite Proportions H20 Looking at …

  6. JohnDalton -English school teacher & scientist -Early 1800’s -Atomic Theory of Matter -Law of Multiple Proportions

  7. Dalton’s Periodic Chart

  8. Dalton’s Model of an Atom

  9. William Crookes -1832-1919 -English Chemist -developed the cathode ray tube

  10. Cathode Ray Tubes Cathode Ray Tube in Action

  11. Michael Faraday -1791-1867 -English chemist and Physicist -Electromagnetic induction Induction

  12. Ben Franklin -1706-1790 -scientist, inventor, statesman -looked at electrical charges

  13. Chadwick -studied alpha particles to discover neutrons

  14. JJ Thomson • -English physicist early 1900’s • -Worked with cathode ray tubes

  15. Electron Beam in CRT

  16. Plum Pudding Model - + - + + - + - + + + - -

  17. Ernest Rutherford -New Zealand Scientist early 1900’s -Alpha scattering experiment

  18. 98% of the particles passes straight through 2% of the particles deflected off at varying angles 0.01% of the particles bounced straight back

  19. Rutherford’s Model of an atom - - + + + - + + + + - - -

  20. Max Planck -German Physicist -1858-1947 -studied light emitted from objects

  21. Planck’s Theory … What does it mean? E = h v

  22. Photoelectric Effect

  23. Albert Einstein -1879-1955

  24. Niels Bohr -Danish physicist early 1900’s -Used Rutherford’s planetary idea -Used Plank’s idea of “quanta”

  25. Planetary model of an atom

  26. Robert Millikan -1868-1953 -American physicist

  27. Milikan’s Oil Drop Experiment On-line Model

  28. Werner Heisenberg -1901-1976 -Uncertainty Principle

  29. What’s that? Sign your planner? We’re talking quantum mechanics here folks … Erwin Schrodinger

  30. Schrodinger wave model of an atom orbitron

  31. Henri Becquerel Marie and Pierre Curie

  32. Henry Moseley -1887-1915 -Rutherford’s student

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