An element has several isotopes.
Which statement about these isotopes is correct?
They have the same number of neutrons but different numbers of protons.
They have the same number of protons but different numbers of neutrons.
They have the same nucleon number but different proton numbers.
They have different chemical properties because of their different mass numbers.
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.