AQA GCSE Chemistry Unit 1 Higher Verified Guide
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AQA GCSE Chemistry Unit 1 Higher Verified Guide 1. What is the smallest unit of an element that can exist, composed of protons, neutrons, and electrons? Answer: The atom is the smallest unit of an element that can exist. 2. How do elements differ from compounds and mixtures? Answer: Elements are made up of one kind of atom, whereas compounds are formed by combining two or more elements chemically, and mixtures are a combination of two or more substances that are not chemically combin...