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
170 exam-style questions on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.