Measurements are made for two different nuclei. The positive charge of a nucleus is known to be carried by protons. A proton has a relative charge of +1 and a relative mass of 1.
| Nucleus | Relative positive charge | Measured relative mass |
|---|---|---|
| P | +4 | 9 |
| Q | +9 | 19 |
A scientist suggests that each nucleus contains protons only.
Explain why the data do not support the scientist's model.
Your answer should include the number of each type of particle in each nucleus.
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.