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This lesson covers the trends across periods and down groups in the periodic table — as required by the Edexcel GCSE Chemistry specification (1CH0), Topic 1: Key Concepts in Chemistry. You need to be able to describe and explain trends in reactivity, atomic radius, and character (metallic/non-metallic) in terms of electron structure.
When you move down a group in the periodic table, several properties change in a predictable way. These trends are caused by changes in electron structure — specifically, the number of electron shells increases.
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