What is nuclear fusion?
the splitting of a heavy nucleus into two or more smaller, lighter nuclei
the joining together of two light nuclei to form a heavier nucleus
the emission of electromagnetic radiation from an atom
the removal of electrons from an atom to form a positive ion
170 exam-style questions on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.