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GCSE Chemistry - Isotopes IN UNDER 30 SECONDS Master isotopes for GCSE Chemistry with a clear, exam-focused explanation. In this lesson you’ll learn what isotopes are, why atoms of the same element can have different mass numbers, and exactly how this appears in exam questions. Ideal for AQA, Edexcel and OCR revision and for students aiming for top grades. If you want structured lessons, walkthroughs and exam practice that actually improves your marks, join here: https://www.kayscience.com/regis
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