What is an atomic model?
What is an atomic model?
An atomic model is a scientific description of what an atom contains and how its parts are arranged. An atom is the smallest particle of an element that can exist, while a subatomic particle is a particle smaller than an atom, such as a proton, neutron or electron.
Step-by-step lessons on Edexcel GCSE Chemistry 2.1.1 Development of the atomic model. 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.