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(Edexcel GCE Jan 2011, 6CH01, Q17b) Draw a dot-and-cross diagram of a molecule of carbon dioxide. Show outer electrons only. (2 marks) (Edexcel GCSE Jun 2013, 5CH2H, Q2(iii)) 3 a State what is meant by the term relative isotopic mass. (2 marks) (Edexcel GCE Jun 2012, 6CH01, Q21(a)) b State what is meant by the term isotopes. (2 marks) ................
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