Two nuclei are different isotopes of the same element. Which statement correctly describes their composition?
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 the same number of protons and the same number of neutrons.
They have a different number of protons and a different number of neutrons.
170 exam-style questions on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.