The History of the Atom Part 2 – The discovery of subatomic particles



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The History of the Atom

  • Part 2 – The discovery of subatomic particles


J.J. Thomson

  • Discovered the electron with cathode ray experiment

  • Plum pudding model



Today’s Thomson Analogy





Robert Millikan

  • An American

  • Discovered the charge/mass of the electron

  • Oil Drop Experiment





Oil Drop Experiment

  • Balanced the gravitational and electric forces on tiny charged droplets of oil suspended between two metal electrodes

  • By knowing the electric field, the charge on the oil droplet could be determined.

  • Repeating the experiment for many droplets, he found that the values measured were always multiples of the same number.



Electron

  • Smallest particle

  • Almost no mass

  • Negative charge

  • Abbreviated e-



Ernest Rutherford

  • Discovered that most of the atom is empty space using the gold foil experiment

  • Discovered the nucleus

  • Also given credit for coining the name proton











Rutherford’s model

  • Mostly empty space

  • Center area is the Nucleus

  • Little Blue dots are electrons



Rutherford Analogy



James Chadwick

  • Discovered the neutron in 1932



Protons and Neutrons

  • Neutrons

  • Have no charge

  • Are responsible for isotopes

  • Roughly same mass as a proton

  • Found in the nucleus



Nucleus

  • Tiny dense region in the center of the atom

  • Over 99% of the mass of the atom found here.

  • Made of protons and neutrons



Homework

  • Summarize the 9 scientists that we talked about the past 2 days on the Scientist Timeline Paper

  • You will not use all the blanks yet.



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