A nucleus Y\text{Y}Y has 11 protons and 12 neutrons. Which notation is correct for this nucleus?
1123Y^{23}_{11}\text{Y}1123Y
2311Y^{11}_{23}\text{Y}2311Y
1211Y^{11}_{12}\text{Y}1211Y
1112Y^{12}_{11}\text{Y}1112Y
284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.