The nucleus of an atom W\text{W}W is represented by the notation NMW^{M}_{N}\text{W}NMW. How many protons and how many neutrons are in this nucleus?
protons = MMM, neutrons = NNN
protons = NNN, neutrons = MMM
protons = MMM, neutrons = N−MN - MN−M
protons = NNN, neutrons = M−NM - NM−N
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.