CAIE A Level Chemistry 9701 · Atomic structure
Describe what is meant by the term isotope, using carbon-12 and carbon-14 as examples. Interpret the two numbers shown in the symbol . State how the chemical properties of the two isotopes compare, and how their physical properties, such as mass and density, compare. Explain the reasons for any differences you state.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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