Scientists' ideas about the structure of the atom have changed over time.
J.J. Thomson discovered a particle that is much smaller than an atom.
Name this particle.
Thomson then suggested the plum pudding model of the atom.
Describe the plum pudding model.
The plum pudding model was later replaced by the nuclear model. Bohr then improved the nuclear model.
Describe what Bohr's model showed about the electrons.
Explain why scientists replace one model of the atom with a new model.
44 exam-style questions on OCR GCSE Physics 1.1 The particle model, covering 1.1.1 Development of the atomic model, 1.1.2 Structure of the atom, 1.1.3 The size of atoms and small molecules, 1.1.4 Density, 1.1.5 Density and the states of matter, and 1.1.6 Density, mass and volume. Each one has a worked solution and a mark scheme showing where the marks go.