Summer 2026 Predicted
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,1 An element R forms a chloride with the formula RCl₃.
The mass spectrum of element R shows three peaks corresponding to different
isotopes, as shown in the table below.
m/z relative abundances (%)
27 78
28 4
29 18
(a) Calculate the relative atomic mass of R and suggest its identity.
(3)
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, (b) (i) State what the formula RCl₃ suggests about the likely position of R in the
Periodic Table.
(1)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
(ii) Write the most likely electron configuration of element R.
(1)
……………………………………………………………………………………………………………………………………
(c) The first four ionization energies of R (in kJ mol⁻¹) are:
578, 1817, 2745, 11,578
(i) Write an equation for the third ionization energy of R.
(2)
……………………………………………………………………………………………………………………………………
(ii) Use the ionization energy data to confirm that R forms RCl₃ rather than RCl₂
or RCl₄. Explain your reasoning.
(3)
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(Total for Question 1 = 10 marks)
for more papers: tyrionpapers.com
for more papers: tyrionpapers.com
,1 An element R forms a chloride with the formula RCl₃.
The mass spectrum of element R shows three peaks corresponding to different
isotopes, as shown in the table below.
m/z relative abundances (%)
27 78
28 4
29 18
(a) Calculate the relative atomic mass of R and suggest its identity.
(3)
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, (b) (i) State what the formula RCl₃ suggests about the likely position of R in the
Periodic Table.
(1)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
(ii) Write the most likely electron configuration of element R.
(1)
……………………………………………………………………………………………………………………………………
(c) The first four ionization energies of R (in kJ mol⁻¹) are:
578, 1817, 2745, 11,578
(i) Write an equation for the third ionization energy of R.
(2)
……………………………………………………………………………………………………………………………………
(ii) Use the ionization energy data to confirm that R forms RCl₃ rather than RCl₂
or RCl₄. Explain your reasoning.
(3)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
(Total for Question 1 = 10 marks)
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