Atomic Structure | Year 9 Chemistry PowerPoint Lesson

Build secure GCSE-ready foundations with this colourful, visual, ready-to-teach PowerPoint lesson on atomic structure and the periodic table. Pupils learn exactly what protons, neutrons and electrons are, their relative charges and masses, and how to use atomic number and mass number to calculate a full particle count, worked through step by step with sodium. A clear explanation of electron shells (2,8,8 filling) links directly into why the periodic table is arranged into groups and periods, and a dedicated slide on isotopes explains why relative atomic mass is often a decimal. A misconceptions slide corrects persistent errors, including the idea that mass number is a mass in grams. Two interactive, hands-on activities embed the maths: pupils build and diagram an atom from given data, then play isotope detective with real particle counts. Teacher prompts on every slide make it non-specialist friendly and ideal as a cover lesson, and the stretch slide connects today’s work directly to GCSE ion calculations and relative atomic mass. A matching cover image is included.

Keywords: KS3, Year 9, Chemistry, science, atomic structure, protons neutrons electrons, atomic number, mass number, periodic table, isotopes, PowerPoint lesson, cover lesson, GCSE Chemistry