The table gives the numbers of protons, neutrons and electrons in four particles, A, B, C and D.
Table: The numbers of protons, neutrons and electrons in four particles
| Particle | Number of protons | Number of neutrons | Number of electrons |
|---|---|---|---|
| A | 8 | 8 | 8 |
| B | 8 | 10 | 8 |
| C | 9 | 10 | 10 |
| D | 10 | 10 | 10 |
Give the letters of the two particles that are isotopes of the same element.
Give the letter of the particle that is a negatively charged ion.
Explain your answer to part b).
Give the mass number of particle B.
40 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1a Atoms, elements and compounds, 1.1.1b Half equations and ionic equations, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.