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[http://www.nist.gov/public_affairs/images/04PHY014_HipHopAtomSurfc_HR.jpg]. Atomic Model Evolution. Democritus (450 BC) Matter was made of small particles called “atomos” which could not be broken apart any further. [http://faculty.washington.edu/smcohen/320/Democritus.jpg].

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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. Atomic Model Evolution • Democritus (450 BC) • Matter was made of small particles called “atomos” which could not be broken apart any further. [http://faculty.washington.edu/smcohen/320/Democritus.jpg]

  3. Atomic Model Evolution • John Dalton (1807) • Thought atoms existed as small spheres. [http://www.kjemi.uio.no/software/dalton/graphics/john_dalton.gif]

  4. Atomic Model Evolution • John Thompson (1904) • Used “CRT” to find electrons in an atom. • Thought the electrons were spread through the atom like a chocolate chip cookie. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_04/FG04_03.JPG[ Click Here For CRT Demo

  5. Cathode Ray Tube is what some televisions use to create a picture [http://www.cheniere.org/images/Magnet%20on%20TV.jpg]

  6. Atomic Model Evolution • Ernest Rutherford (1911) • Used gold foil experiment to find the nucleus of an atom. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_04/FG04_04.JPG]

  7. Click here for a video clip. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_04/FG04_05.JPG]

  8. Atomic Model Evolution • Niels Bohr (1913) • Thought electrons orbited nucleus like planets around the sun. [http://csep10.phys.utk.edu/astr162/lect/light/bohrframe/bohr2.gif]

  9. Atomic Model Evolution • This restricts electrons to certain orbits and cannot effectively model every element! [http://www.incompetech.com/gallimaufry/signs/bohr.gif]

  10. Atomic Model Evolution • Electron Cloud Model (1926 – Today) • Electrons appear more often in some places rather than others around the nucleus in “clouds” • Probablity!!!

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