Topic 10.2 · Theme 10: Atoms and radioactivity
Opening this topic…
Atomic number, mass number and isotopes is a GCSE Physics topic with curated notes, study guides, and focused revision support. Atomic number, mass number and isotopes sits within Theme 10: Atoms and radioactivity in the GCSE Physics topic outline.
Review the core idea, test it with active recall, practise applying it to GCSE-style prompts, and compare your work with current course materials and teacher guidance.
Quick answer
Atomic number, mass number and isotopes in GCSE Physics includes 4 focused study resources covering the core ideas, revision points, and study support you need to review this topic efficiently.
What this topic means
Atomic number, mass number and isotopes is part of the GCSE Physics syllabus and is best studied as a concept you can explain, apply, and compare rather than a fact you simply memorize. Strong answers usually show that you understand both the definition of the topic and the role it plays inside the wider unit.
When GCSE exam tasks refer to Atomic number, mass number and isotopes, markers are usually looking for accurate terminology, subject-specific reasoning, and at least one clear example or application. That is why this page combines concise revision resources with guided study support instead of only listing notes.
Start with a one-sentence definition of Atomic number, mass number and isotopes in your own words, then expand it using the exact terminology expected in GCSE Physics.
Use the resources on this page to separate factual recall from application. First learn the idea, then practise using it in short structured responses.
Review Atomic number, mass number and isotopes alongside nearby topics in GCSE Physics so you can compare concepts, avoid mixing terminology, and understand how the topic is framed across the syllabus.