Isotopes and atomic structure
Isotopes and atomic structure
The atomic number is the number of protons in an atom. The mass number is the total number of protons and neutrons.
Step-by-step lessons covering AQA GCSE Chemistry 1.1.6 Relative atomic mass for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.