Why atomic models change
Why atomic models change
An atomic model is a scientific description of what an atom contains and how its parts are arranged. Because atoms are too small to see directly, models are tested against experimental evidence.
Step-by-step lessons on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.