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[http://www.nist.gov/public_affairs/images/04PHY014_HipHopAtomSurfc_HR.jpg]. Democritus (450 BC). Everything is made up of small particles called “atomos”. These particles were indivisible. [http://faculty.washington.edu/smcohen/320/Democritus.jpg]. Dalton’s Atomic Theory (1807).

caitlin-kerwick
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  1. [http://www.nist.gov/public_affairs/images/04PHY014_HipHopAtomSurfc_HR.jpg][http://www.nist.gov/public_affairs/images/04PHY014_HipHopAtomSurfc_HR.jpg]

  2. Democritus (450 BC) • Everything is made up of small particles called “atomos”. • These particles were indivisible. [http://faculty.washington.edu/smcohen/320/Democritus.jpg]

  3. Dalton’s Atomic Theory (1807) • Elements are composed of atoms. • Atoms of a specific element are identical. [http://www.kjemi.uio.no/software/dalton/graphics/john_dalton.gif]

  4. Dalton’s Atomic Theory (1807) • Atoms are not created or destroyed in reactions. • A compound always has the same combination of atoms [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter02/Text_Images/FG02_02.JPG]

  5. The Electron • Benjamin Franklin (mid-1700’s) • (+) and (-) charges exist. • Did not know where they came from. [http://www.npl.co.uk/publications/electricity/images/kite.gif]

  6. The Electron • Cathode Ray Tube or CRT (mid-1800’s) • “Beam” traveled from positive to negative end of tube. Click Here for a CRT Video [http://members.chello.nl/~h.dijkstra19/image/burning%20ray%20tube.jpg]

  7. [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter02/Text_Images/FG02_03.JPG][http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter02/Text_Images/FG02_03.JPG]

  8. [http://www.cheniere.org/images/Magnet%20on%20TV.jpg]

  9. The Electron • Thompson’s “Plum Pudding Model” (1896) • Light is not moved by a magnet, so the “light” in the CRT must be charged particles in atoms.

  10. Radioactive Particles • Becquerel & Curie (1896) • Certain elements emit both negative and positive particles

  11. Radioactive Particles • Rutherford’s Gold Foil Experiment. • Shot radioactive particles at a thin piece of gold.

  12. Click here for video of actual results

  13. Radioactive Particles • Rutherford concluded that all the positive charges of an atom would be contained in the middle or nucleus.

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