Part 2 – The discovery of subatomic particles
J.J. Thomson Discovered the electron with cathode ray experiment Plum pudding model
Robert Millikan An American Discovered the charge/mass of the electron 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 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
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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