1. Atoms and The Periodic Table KD McMahon Reseda Science Magnet

2. Aristotle and Democritus Aristotle: Essence/Form Potential --> Actual Four Elements

3. Aristotle and Democritus Democritus a’ tome = not cut makes up everything many different kinds exist forever only matter

4. John Dalton Atoms of same element are identical atoms combine --> whole # ratios --> compounds chem Rx’s: atoms separate & recombine no transmutation

5. Review Questions: 1.Why did Democritus call his fundamental particle of matter the “atom?” 2. Why was Democritus’ theory rejected for so many centuries? 3. Based on Dalton’s atomic theory what would be wrong with the following formula for water: HO 1/2 4. According to Dalton would it have been possible for alchemists to have turned lead into gold?

6. JJ Thomson Used cathode ray tubes

7. JJ Thomson Used cathode with paddle wheel: What did he conclude?

8. JJ Thomson Used cathode with oppositely charged plates:

9. JJ Thomson Used cathode with oppositely charged plates:

10. JJ Thomson Used cathode with oppositely charged plates: What did he conclude?

11. JJ Thomson From these results he came up with: The Plum Pudding Model of the Atom