Question
A sample of bromine contains 55.0% bromine-79 atoms and 45.0% bromine-81 atoms.
[2 marks]
Calculation
Type your answer
Include the unit where there is one (e.g. a magnification ×100, or a rate in cm³/min).
Modelled on Cambridge 0620 · May/Jun 2025 · Paper 43 · Q2(b)(ii)
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Modelled on Cambridge 0620 · May/Jun 2025 · Paper 43 · Q2(b)(ii)