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History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
History Of Atomic Structure
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History Of Atomic Structure

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  • 1. Bellwork 10/12/06 <ul><li>How long have people been interested in understanding matter and its structure? </li></ul><ul><ul><ul><li>Thousands of years </li></ul></ul></ul><ul><ul><ul><li>Hundreds of years </li></ul></ul></ul><ul><ul><ul><li>A few years </li></ul></ul></ul><ul><ul><ul><li>Never </li></ul></ul></ul>
  • 2. History of Atomic Structure
  • 3. Ancient Philosophy <ul><li>Who: Aristotle, Democritus </li></ul><ul><li>When: More than 2000 years ago </li></ul><ul><li>Where: Greece </li></ul><ul><li>What: Aristotle believed in 4 elements: Earth, Air, Fire, and Water. Democritus believed that matter was made of small particles he named “atoms”. </li></ul><ul><li>Why: Aristotle and Democritus used observation and inferrence to explain the existence of everything. </li></ul>
  • 4. Aristotle Democritus
  • 5. Alchemists <ul><li>Who: European Scientists </li></ul><ul><li>When: 800 – 900 years ago </li></ul><ul><li>Where: Europe </li></ul><ul><li>What: Their work developed into what is now modern chemistry. </li></ul><ul><li>Why: Trying to change ordinary materials into gold. </li></ul>
  • 6. Alchemic Symbols
  • 7. Particle Theory <ul><li>Who: John Dalton </li></ul><ul><li>When: 1808 </li></ul><ul><li>Where: England </li></ul><ul><li>What: Described atoms as tiny particles that could not be divided. Thought each element was made of its own kind of atom. </li></ul><ul><li>Why: Building on the ideas of Democritus in ancient Greece. </li></ul>
  • 8. John Dalton
  • 9. Discovery of Electrons <ul><li>Who: J. J. Thompson </li></ul><ul><li>When: 1897 </li></ul><ul><li>Where: England </li></ul><ul><li>What: Thompson discovered that electrons were smaller particles of an atom and were negatively charged. </li></ul><ul><li>Why: Thompson knew atoms were neutrally charged, but couldn’t find the positive particle. </li></ul>
  • 10. J. J. Thompson
  • 11. Atomic Structure I <ul><li>Who: Ernest Rutherford </li></ul><ul><li>When: 1911 </li></ul><ul><li>Where: England </li></ul><ul><li>What: Conducted an experiment to isolate the positive particles in an atom. Decided that the atoms were mostly empty space, but had a dense central core. </li></ul><ul><li>Why: He knew that atoms had positive and negative particles, but could not decide how they were arranged. </li></ul>
  • 12. Ernest Rutherford
  • 13. Atomic Structure II <ul><li>Who: Niels Bohr </li></ul><ul><li>When: 1913 </li></ul><ul><li>Where: England </li></ul><ul><li>What: Proposed that electrons traveled in fixed paths around the nucleus. Scientists still use the Bohr model to show the number of electrons in each orbit around the nucleus. </li></ul><ul><li>Why: Bohr was trying to show why the negative electrons were not sucked into the nucleus of the atom. </li></ul>
  • 14. Niels Bohr
  • 15. Electron Cloud Model <ul><li>Electrons travel around the nucleus in random orbits. </li></ul><ul><li>Scientists cannot predict where they will be at any given moment. </li></ul><ul><li>Electrons travel so fast, they appear to form a “cloud” around the nucleus. </li></ul>
  • 16. Electron Cloud Model
  • 17. Atomic Structure Timeline <ul><li>Requirements: </li></ul><ul><li>Must include a title. </li></ul><ul><li>Must include a spot for each of the 7 items. </li></ul><ul><li>Must include at least the Who , When , and What . </li></ul><ul><li>Must have a picture (color is preferred) for each item. </li></ul><ul><li>Options: </li></ul><ul><li>Comic book format </li></ul><ul><li>Standard timeline </li></ul>

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