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Chemistry tutorial-Ch7-6-Formulae of ionic compounds

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Chemistry tutorial-Ch7-7-Names of ionic compounds

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Chemistry tutorial-Ch7-8-Colours of ions

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Chemistry tutorial-Ch7-9-Migration of ions

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Example-Ch7-1-Electron diagrams of the first 20 elements

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Example-Ch7-2-Electron diagrams of ionic compounds

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Biological concepts Ch.2(20) - Cell theory

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Biological concepts Ch.2(21) - Microscopic technology

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Biological concepts Ch.2(22) - Using a light microscope

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