CAIE A Level Chemistry 9701 · Atomic structure

Atomic structure: suggest question

Suggest4 marksStandard

Magnesium exists as three isotopes, X1224X212224Mg\ce{^{24}_{12}Mg}, X1225X212225Mg\ce{^{25}_{12}Mg} and X1226X212226Mg\ce{^{26}_{12}Mg}.

Suggest what is meant by the term isotope.

Suggest why these isotopes have the same chemical properties, and why their physical properties, such as mass and density, are different.

0 words · 4 marks

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How this question is marked

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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