Chemistry ch 2

Chemistry ch 2

1. John Dalton

   • Atomic Theory: All matter is made up of very small particles called atoms. Atoms are indivisible they cannot be broken down into smaller particle

2. Robert Millikan

   • Measured the charge on the electron using oil drop experiment

3. William crookes

   • Discovered the cathode rays through a vacuum tube and a maltese cross

4. J.J. Thomson

   • Showed that electrons are negatively charged
   • measured the e/m of the electron
   • Proposed a simple "Plum Pudding" model

5. Ernest Rutherford

   • Discovered the nucleus of the atom and the existence of protons in the nucleus

6. James Chadwick

   • Discovered the neutron