| A | B |
|---|
| 1808: Dalton's Model | He imagimed that atoms are solid balls |
| 1897: Thompson model | He discovered the electron |
| 1904: Nagaoka Model | A model that had a large positive sphere in the center and electrons revolving aroung it like planets |
| 1911: Rutherford Model | The atom ismostly empty space, electrons orbit randomly |
| 1913: Bohr Model | Electrons moving in layers or shells, Atoms absorb or give off energy when electrons move |
| 1932: Chadowick Model | Discovereed the neutron |
| Present: | The current atomic model; The electron cloud |
| Atoms: | They are too small to be measured in grams |
