Before the discovery of the electron, what were atoms thought to be?
Tiny spheres with a positive charge spread all the way through them
Tiny spheres with negatively charged particles embedded inside them
Tiny spheres with a small positively charged nucleus at their centre
Tiny spheres that could not be divided into anything smaller
40 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1a Atoms, elements and compounds, 1.1.1b Half equations and ionic equations, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.