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Atomic Theory:

CU 3221.1.1 Identify the contributions of the major atomic theorists: Niels Bohr, James Chadwick, John Dalton, Max Planck, Ernest Rutherford, and J.J. Thomson.

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Atomic Theory:

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  1. CU 3221.1.1 Identify the contributions of the major atomic theorists: Niels Bohr, James Chadwick, John Dalton, Max Planck, Ernest Rutherford, and J.J. Thomson. SPI 3221.1.1 Compare and contrast the major characteristics of various models of the atom: Democritus, Thomson, Rutherford, Bohr, and the Quantum Mechanical Model. Atomic Theory: The Who’s Who of Atoms

  2. https://www.youtube.com/watch?v=xazQRcSCRaY

  3. Democritus • ~460 BCE. • Defined atom as the “smallest bit of matter.” • 100 years later, Aristotle dismissed his idea as “worthless.”

  4. John Dalton • 1805 • Said matter consisted of “elementary lumpy particles” • First Atomic Theory • “BowlingBall” Model of the Atom

  5. Dalton’s Atomic Theory • All matter is made of tiny particles called atoms. • All atoms of one element are alike. • Atoms of one element are different from atoms of other elements. • Compounds are formed when atoms from different elements combine. • Chemical reactionsinvolve re-arrangement of atoms, not changes in atoms themselves.

  6. Dalton’s Atomic Model

  7. J.J. Thomson • 1897 • Discovered the electron with his Cathode Ray Tube Experiment • Came up with “Plum Pudding Model” of atom

  8. Cathode Ray Tube Experiment Cathode Ray Tube Experiment • https://www.youtube.com/watch?v=GzMh4q-2HjM

  9. Plum Pudding Model “Real” Plum Pudding

  10. Max Planck • 1900 • When you vibrate atoms enough (heat it until it glows), you only get energy back in whole intervals: energy packets called “quanta.”

  11. Ernest Rutherford • 1911 • Discovered the nucleus with his Gold Foil Experiment • Nucleus: the small, dense, positively-charged center of the atom • In 1919, he identified “protons”

  12. https://www.youtube.com/watch?v=wzALbzTdnc8

  13. Rutherford’s Atomic Model

  14. Robert A. Millikan • 1916 • Found charge and mass of electron with his Oil Drop Experiment • https://www.youtube.com/watch?v=nwnjYERS66U

  15. Millikan’s Oil Drop Experiment Oil Drop Experiment

  16. Niels Bohr • 1912 • Developed planetary model of the atom • Discovered that electrons move around the nucleus at set distances • Called these “electronorbitals.”

  17. Electron Orbitals

  18. Bohr’s Model of the Atom

  19. James Chadwick • 1932 • Discovered the neutron

  20. So Then We Have This!

  21. Let’s Memorize These Guys! • Open all the windows. • Ask your partner “Who did….” • If they get it right, close the window. • If they get it wrong, leave the window open and come back to it until they get it right. • Take turns! • Quiz each other until you are sure you will ace the real quiz next class!

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