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Group 7 HALOGENS fluorine chlorine bromine iodine physical properties balanced equations chemical reactions balanced gcse chemistry revision notes KS4 science igcse O level for AQA Edexcel OCR exams
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Group 7 HALOGENS fluorine chlorine bromine iodine physical properties balanced equations chemical reactions balanced gcse chemistry revision notes KS4 science igcse O level for AQA Edexcel OCR exams
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