Summer 2026 Predicted
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,1 Bromine consists of two isotopes, bromine-79 and bromine-81, which are
equally abundant.
(a) State what is meant by the term 'isotope'
(2)
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(b) Copy and complete the table below to show the composition of the ⁷⁹Br and
⁸¹Br isotopes.
(2)
Isotope Protons Neutrons Electrons
⁷⁹Br
⁸¹Br
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,(c) The mass spectrum of bromine is shown below
(i) Explain why the mass spectrum of bromine includes two lines with m/z values of
79 and 81 with heights in the ratio 1:1.
(2)
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, (ii) Explain why the mass spectrum of bromine includes three lines with m/z values
of 158, 160 and 162 with heights in the ratio 1:2:1.
(4)
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(Total for Question 1 = 10 marks)
for more papers: tyrionpapers.com
for more papers: tyrionpapers.com
,1 Bromine consists of two isotopes, bromine-79 and bromine-81, which are
equally abundant.
(a) State what is meant by the term 'isotope'
(2)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
(b) Copy and complete the table below to show the composition of the ⁷⁹Br and
⁸¹Br isotopes.
(2)
Isotope Protons Neutrons Electrons
⁷⁹Br
⁸¹Br
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,(c) The mass spectrum of bromine is shown below
(i) Explain why the mass spectrum of bromine includes two lines with m/z values of
79 and 81 with heights in the ratio 1:1.
(2)
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, (ii) Explain why the mass spectrum of bromine includes three lines with m/z values
of 158, 160 and 162 with heights in the ratio 1:2:1.
(4)
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(Total for Question 1 = 10 marks)
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