The electron- Thomson’s Experiments :
The electron- Thomson’s Experiments Cathode-Ray Tubes- stream of electrons
Charge: Charge Video
Mass? : Mass Video
Thomson’s model of the atom :
Thomson’s model of the atom From his experiments, Thomson thought the atom was a “sphere of positive charge” with electrons inside of it
The Nucleus :
The Nucleus Rutherford’s Gold Foil Experiment to test Thomson’s model
alpha particle beam (2 p+, 2 n)
Gold foil sample in the middle
Detector ring
Rutherford Video
Rutherford’s model :
Rutherford’s model A positive nucleus that holds most of the mass of the atom, with the electrons orbiting it.