An atom has a radius of about 1 × 10-10 m. Almost all of the mass of the atom is in its nucleus.
Give the names of the two types of particle that give the nucleus almost all of the mass of an atom.
A student writes, 'The electrons take up nearly all of the volume of an atom, so the electrons must have nearly all of its mass.' Explain why the student is wrong.
40 exam-style questions on AQA GCSE Physics 4.1 Atoms and isotopes, covering 4.1.1 The structure of an atom, 4.1.2 Mass number, atomic number and isotopes, and 4.1.3 The development of the model of the atom (common content with chemistry). Each one has a worked solution and a mark scheme showing where the marks go.