Which statement correctly describes the similarity and difference between atoms of two different isotopes of the same element?
They have the same number of neutrons but a different number of protons.
They have the same number of protons but a different number of neutrons.
They have different numbers of protons and different numbers of electrons.
They have the same number of neutrons and the same number of protons.
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.