Two particles, P and Q, are from the same element. The table gives information about particle P.
| Number of electrons | Overall relative charge | Number of neutrons |
|---|---|---|
| 24 | +2 | 30 |
Calculate the number of protons in particle P.
The nucleus of particle Q has a mass number of 58.
Calculate the number of neutrons in the nucleus of Q.
Explain why the nuclei of P and Q have different mass numbers but the same nuclear charge.
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.