| A | B |
|---|
| quanta | discrete amount of energy |
| photon | certain amount of light energy that can be absorbed/released by an electron |
| cathode-ray tube | led to discovery of the electron |
| oil-drop experiment | led to measurement of electron's charge and mass, and mass of proton |
| radioactive decay | realization that atoms do break apart |
| gold foil experiment | discovery of the nucleus |
| quark | fundamental building blocks of protons and neutrons |
| uncetainity principle | it is not possible to know both the exact location and speed of an electron at the same time |
| more recent studies with radioactivity | discovery of neutron |
