A computer model follows an unstable nucleus through a short chain of nuclear changes. The only changes that occur are beta-minus decay and neutron emission.
| Stage | Number of protons | Number of neutrons |
|---|---|---|
| Start | 50 | 90 |
| End | 52 | 85 |
How many beta-minus decays and neutron emissions occurred?
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.