An unstable nucleus in a zircon crystal contains 92 protons and 146 neutrons. It emits an alpha particle, and the daughter nucleus then emits a beta-minus particle.
| Record | Number of protons | Number of neutrons |
|---|---|---|
| A | 91 | 143 |
| B | 89 | 145 |
| C | 91 | 144 |
| D | 90 | 144 |
Which record gives the numbers of protons and neutrons in the final nucleus?
Record B
Record A
Record D
Record C
120 exam-style questions on Edexcel GCSE Physics 6.3 Nuclear equations and decay, covering 6.3.1 Beta-minus and beta-plus decay, 6.3.2 Effects of decay on the nucleus, and 6.3.3 Balancing nuclear equations. Each one has a worked solution and a mark scheme showing where the marks go.