22   9 This question is about ionisation energy. (a) The first four ionisation energies, in kJ mol–1, of four elements are shown. Which element is in Group 3? (1) A   738 1451 7753 10 541 B   578 1817 2745 11 578 C   789 1577 3232    4356 D 1012 1903 2912    4957 (b) The second ionisation energy of beryllium is more endothermic than the first ionisation energy. (i) Write an equation for the second ionisation of beryllium. Include state symbols. (2) Turn over 23   *(ii) Explain how the nuclear structure and the electronic structure of the Group 2 elements affect ionisation energies. Include: • an explanation of the trend of the first ionisation energies down the group • a comparison of the first two ionisation energies for an element. 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.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 25   (iii) The value of the sum of the first and second ionisation energies changes on descending Group 2. Explain how this changing value might contribute to the relative reactivity of the elements with chlorine. 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(Total for Question 9 = 11 marks) TOTAL FOR PAPER = 80 MARKS 26   BLANK PAGE 27   BLANK PAGE 28  