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Ideas about Atoms

Ideas about Atoms. by Put Your Name Here. Your task. Make a PowerPoint presentation on how our ideas about atomic structure have changed over the last 2500 years. This template will help you.

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Ideas about Atoms

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  1. Ideas about Atoms by Put Your Name Here

  2. Your task • Make a PowerPoint presentation on how our ideas about atomic structure have changed over the last 2500 years. • This template will help you. • There is information on page 372 in Physics for You.Your teacher may give you an Extension Sheet with some facts. You can find more from the Internet. See the next slide to find out how.

  3. TextSearch using one of the following sites. Enter a phrase or name in the search box. www.google.com www.ask.com www.lycos.com Pictures:Go to www.google.comand click on “Images”. Finding information on the Internet

  4. Democritus Use this slide to explain what Democritus suggested.

  5. John Dalton Which of Dalton’s “elements” do we still think of as elements today? What did Dalton’s model of an atom help to explain?

  6. J. J. Thompson Why was J J Thompson’s 1897 discovery important? What is the ‘plum-pudding’ model of the atom?

  7. Brownian Motion Theory Why was Einstein’s Brownian Motion explanation important? What does Brown’s pollen particle moving randomly in water tell us?

  8. Ernest Rutherford Find an image of Ernest Rutherford and place it here. How was Rutherford’s atomic model different to JJ Thompson’s ‘plum-pudding’ model?

  9. Alpha-particle scattering Tell us about the experiment carried out by Geiger and Marsden for Rutherford A picture of the experiment would help.

  10. James Chadwick How did Chadwick discover that a nucleus contains neutrons? How do neutrons explain the existence of isotopes?

  11. Quarks Try to find an image for here, that will help to explain. Today’s model of the atomic nucleus is complicated. Use this slide to try to explain about ‘quarks’ and the ideas of Murray Gell-Mann

  12. Delete the instructions when you are finished. Add some pictures as appropriate.

  13. Extra Task • Democritus (440 BC) suggested the idea of atoms but with no proof. Eventually Robert Boyle’s experiments (1662) supported the idea and in 1738 Daniel Bernoulli proposed the kinetic theory. • John Dalton used atomic weights (1805) to support the idea, and in 1831 Thomas Graham investigated diffusion. • Henri Becquerel discovered radioactivity (1896) and Marie Curie discovered radium (1898). Ernest Rutherford discovered alpha and beta rays. Rutherford came up with the idea of an atomic nucleus. • Niels Bohr (1913) suggested the idea of electrons in orbits with different energies. • Write a slide or more about the new ideas that each of these scientists brought to the topic.

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