The Atom and Subatomic Particles — The atom; The three subatomic particles; Atomic number and mass number; Electron shells (energy levels); Isotopes; History of the atom (models)
Isotopes and Relative Atomic Mass — Isotopes; Mass Number and Atomic Number; Relative Atomic Mass (Ar); Calculating Relative Atomic Mass; Working Backwards; Key Exam Points
Electronic Configuration and Ions — Electron Configuration; Electron Configuration and the Periodic Table; Ions; Predicting Ion Charges from the Periodic Table; Ions and Ionic Bonding
History of the Atom — Early Ideas: Dalton's Model (1803); Discovery of the Electron: Thomson's Plum Pudding Model (1897); The Alpha Particle Scattering Experiment (1909); Rutherford's Nuclear Model (1911); Bohr's Model (1913); Discovery of the Neutron: Chadwick (1932)