Pearson Edexcel Level 3 GCE Chemistry Advanced PAPER 1: Advanced Inorganic and Physical Chemistry. question booklet mark scheme results

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question booklet mark scheme results Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark... your new answer with a cross . 1 This is a question about atoms, isotopes and ions. (a) Which of the following pairs of ions is isoelectronic? (1) A N3– and Cl– B O2– and S2– C Na+ and K+ D Na+ and Mg2+ (b) Which is a correct definition of relative isotopic mass? (1) A the weighted mean mass of an atom of an element relative to one twelfth of the mass of an atom of the isotope carbon-12 B the mass of one atom of an isotope relative to one twelfth of the mass of an atom of the isotope carbon-12 C the weighted mean mass of an atom of an element relative to 12 g of the isotope carbon-12 D the mass of one atom of an isotope relative to the mass of 12 g of the isotope carbon-12 [Show More]

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