Rutherford’s experiment Day 2. Last time Discussion of early atomic model- the plum pudding model To refresh your memory: – Large slightly positive mass.

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Presentation transcript:

Rutherford’s experiment Day 2

Last time Discussion of early atomic model- the plum pudding model To refresh your memory: – Large slightly positive mass with tiny negative electrons in it

Deconstructing Thomson’s model You have – A source of alpha particles (positively charged) – Some atoms of the same element (identical) – Detection device (to see where your alpha particles went) How would you test Thomson’s model?

Overview of the gold-foil experiment Hans Geiger and Ernest Marsden shot helium nuclei (alpha particles, +2 charge) at a very thin sheet of gold foil What do you think would happen, based on the plum pudding model?

Rutherford’s experiment- online rford-scattering rford-scattering Make sure to click “show traces”

1) What effect does alpha particle speed have on repulsion? 2) What does the size of the neutron have on repulsion? 3) How does the relative proportion of protons to neutrons affect repulsion?

Rutherford’s conclusions How did this experiment change perceptions of what an atom is? – There is a nucleus with a positive charge (since the + charge must be concentrated) – Most of the atom is empty space!