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who discovered cathode rays?
Who discovered the electron?
are streams of electrons. They travel in straight lines from the cathode to the anode, are deflected by electric and magnetic fields, and have sufficient energy to move a small object such as a paddle wheel
How did Millikan find the size of the charge on the electron?
- His Oil Drop experiment
- Allowed the mass of the electron to be calculated using Thompson's e-m ratio
Thomson's Plum Pudding Model
shows the atom as a sphere of positive charge with electrons embedded in it at random
Discovery of the Nucleus?
Rutherford's gold foil experiment
Who discovered the neutron?
Dalton's Atomic Theory
- All matter is made up of very small particles called atoms
- All atoms are indivisible and cannot be broken down into simpler particles
Discovery of the proton
Rutherford, bombarded light atoms like oxygen which gave off small positively charged particles when bombarded
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