The table shows the composition of three different nuclei:
| Nucleus | Number of protons | Number of neutrons |
|---|---|---|
| PPP | 6 | 6 |
| QQQ | 8 | 6 |
| RRR | 6 | 8 |
Which nuclei are isotopes of the same element?
PPP, QQQ and RRR
PPP and QQQ only
PPP and RRR only
QQQ and RRR only
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.