A computer model contains 40 identical particles. Each particle has a nucleus surrounded by electrons.
| Quantity | Total in the model |
|---|---|
| protons | 520 |
| neutrons | 560 |
| electrons | 480 |
A student concludes that every particle is neutral and has a mass number of 27.
Evaluate the student's conclusion.
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.