The numbers of protons, neutrons, and electrons in four different particles, A, B, C, and D, are shown in the table below.
| Particle | Protons | Neutrons | Electrons |
|---|---|---|---|
| A | 11 | 12 | 10 |
| B | 18 | 22 | 18 |
| C | 8 | 8 | 10 |
| D | 6 | 6 | 6 |
Explain which particle, A, B, C, or D, is a negative ion.
120 exam-style questions on Edexcel GCSE Chemistry 2.1 Atomic structure, covering 2.1.1 Development of the atomic model, 2.1.2 Structure of the atom and subatomic particles, 2.1.3 Mass number, isotopes and relative atomic mass, and 2.1.4 Calculating relative atomic mass from isotopic abundance. Each one has a worked solution and a mark scheme showing where the marks go.