The table gives information about four nuclei.
| Nucleus | Proton number | Nucleon number |
|---|---|---|
| 1 | 6 | 12 |
| 2 | 6 | 14 |
| 3 | 7 | 14 |
| 4 | 8 | 16 |
Which nuclei are isotopes of the same element?
1 and 2
2 and 3
3 and 4
1 and 3
284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.