What is a nitrogen nucleus, 714N^{14}_{7}\text{N}714N, composed of?
7 neutrons and 7 electrons
7 protons, 7 neutrons and 7 electrons
7 protons and 7 electrons
7 protons and 7 neutrons
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.