Year 9 · Science · Chemical sciences
Atoms and isotopes
Students describe the structure of atoms in terms of protons, neutrons and electrons, define isotopes and learn about radioactive decay and its uses in medicine and dating.
Awaiting educator review. This material was drafted by our content team with AI assistance and is waiting for review by a qualified educator. Please check it suits your child before using it. Created 10 October 2026.
This topic is currently an outline — a full lesson with worked examples and practice questions is on our list. In the meantime you can build a lesson plan template for it, or find related worksheets.