Downloadable worksheets for AQA GCSE Physics 4.1 Atoms and isotopes, with answers included. Worksheets 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), matched to the AQA GCSE Physics (8463) specification and suitable for Foundation and Higher tier. Print or work through on screen.