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GCSE Chemistry Practice Exam And Answers Graded A+ 2024.
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What is the centre of an atom called? - Answer Nucleus What are the charges on protons, electrons and neutrons - Answer Protons= +1 Electrons= -1 Neutrons= 0 What are the relative masses of protons, electrons and neutrons - Answer Protons= 1 Electrons= 0.0005 Neutrons= 1 Why are ...
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