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1. A world of particles 2 The Discovery of the Electron: Flashback - The Nature of Electricity; Electric Discharges and Cathode Rays; Flashback - Newton's Laws of Motion; Deflection of Cathode Rays; Flashback - Electric Forces; Electric Deflection of Cathode Rays; Flashback - Magnetic Forces; Magnetic Deflection of Cathode Rays; Thomson's Results; Flashback - Energy; Energy Relations in Thomson's Experiment; Electrons as Elementary Particles 3. The Atomic Scale: Flashback - Atomic Weights; Flashback - Electrolysis; Measuring the Electronic Charge 4 The Nucleus: The Discovery and Explanation of Radioactivity; The Discovery of the Nucleus; Atomic Numbers and Radioactive Series; The Neutron 5 More Particles: Photons; Neutrinos; Positrons; Other Antiparticles; Muons and Pions; Strange Particles; More Hadrons; Quarks. Appendix A Newton's Second Law of Motion B Electric and Magnetic Deflection of Cathode Rays C Electric Fields and Field Lines D Work and Kinetic Energy E Energy Conservation in Cathode-Ray Experiments F Gas Properties and Boltzmann's Constant G Millikan's Oil-drop Experiment H Radioactive Decay 1 Potential Energy in the Atom J Rutherford Scattering K Momentum Conservation and Particle Collisions. Reading Sources of Illustrations Index .