Describe what happens to the atomic nuclei during a nuclear fusion reaction, such as the fusion of deuterium (12H^{2}_{1}\text{H}12H) and tritium (13H^{3}_{1}\text{H}13H).
94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity. Each one has a worked solution and a mark scheme showing where the marks go.