What is the proton number (atomic number) of a nuclide?
the number of protons in the nucleus
the number of neutrons in the nucleus
the number of protons plus the number of neutrons in the nucleus
the number of neutrons minus the number of protons in the nucleus
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.