- Explain how new experimental evidence leads to changes in scientific models.
- Contrast the plum pudding model with the nuclear model of the atom.
- Explain why the alpha particle scattering experiment led to the conclusion that mass is concentrated in a charged nucleus.
- Describe Niels Bohr's adaptation of the nuclear model regarding electron orbits.
- Describe the discovery of the proton and the neutron (Chadwick).
