CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
A naturally occurring sample of element X contains two isotopes. The relative atomic mass of X in this sample is not a whole number.
Suggest what is meant by the relative atomic mass of X, and suggest why the value is not a whole number.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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