Course Introduction This course covers Chemistry Topic C4a: Atomic Structure. This is part of Module C4: The Periodic Table. This information is examined on  Paper 2 of the OCR GCSE Chemistry B course. Isotopes are examined at Higer Tier only. This module is completed by the courses: Bonding: GCSE OCR Chemistry B Purifying and Testing Water: GCSE OCR B Chemistry

The atomic model used today is not the one that was always accepted.  Understanding how this model evolved is important in our understanding of the modern model.  These slides detail how the model has evolved since the idea of an atom was first proposed in 1807