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Bellwork 10/12/06 <ul><li>How long have people been interested in understanding matter and its structure? </li></ul><ul><u...
History of Atomic Structure
Ancient Philosophy <ul><li>Who:   Aristotle, Democritus </li></ul><ul><li>When:  More than 2000 years ago </li></ul><ul><l...
Aristotle Democritus
Alchemists <ul><li>Who:   European Scientists </li></ul><ul><li>When:  800 – 900 years ago </li></ul><ul><li>Where:  Europ...
Alchemic Symbols
Particle Theory <ul><li>Who:   John Dalton </li></ul><ul><li>When:  1808 </li></ul><ul><li>Where:  England </li></ul><ul><...
John Dalton
Discovery of Electrons <ul><li>Who:   J. J. Thompson </li></ul><ul><li>When:  1897 </li></ul><ul><li>Where:  England </li>...
J. J. Thompson
Atomic Structure I <ul><li>Who:  Ernest Rutherford </li></ul><ul><li>When:  1911 </li></ul><ul><li>Where:  England </li></...
Ernest Rutherford
Atomic Structure II <ul><li>Who:  Niels Bohr </li></ul><ul><li>When:  1913 </li></ul><ul><li>Where:  England </li></ul><ul...
Niels Bohr
Electron Cloud Model <ul><li>Electrons travel around the nucleus in random orbits. </li></ul><ul><li>Scientists cannot pre...
Electron Cloud Model
Atomic Structure Timeline <ul><li>Requirements: </li></ul><ul><li>Must  include a title. </li></ul><ul><li>Must  include a...
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History Of Atomic Structure

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Transcript of "History Of Atomic Structure"

  1. 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. 2. History of Atomic Structure
  3. 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. 4. Aristotle Democritus
  5. 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. 6. Alchemic Symbols
  7. 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. 8. John Dalton
  9. 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. 10. J. J. Thompson
  11. 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. 12. Ernest Rutherford
  13. 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. 14. Niels Bohr
  15. 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. 16. Electron Cloud Model
  17. 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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