By 1904, three observations had to be accounted for by a model of the atom.
| Evidence available by 1904 |
|---|
| Cathode rays are streams of tiny particles carrying negative charge. |
| These particles come from inside atoms. |
| Atoms have no overall charge. |
Explain how this evidence led to Dalton's solid sphere model being replaced. In your answer, name the scientist who proposed the replacement model in 1904 and describe how charge was arranged in it.
101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.