Listen to the full series on BBC Sounds. Hans Geiger and Ernest Marsden tested the plum pudding model. They aimed beams of positively-charged particles at very thin gold foil. These particles ...

Listen to the full series on BBC Sounds. Hans Geiger and Ernest Marsden tested the plum pudding model. They aimed beams of positively-charged particles at very thin gold foil. These particles ...

Everyone at that time imagined the atom as a "plum pudding." That is ... He realized that Rutherford's model wasn't quite right. By all rules of classical physics, it should be very unstable.