CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
Magnesium is in Group 2 of the Periodic Table and nitrogen is in Group 5.
Describe, in terms of outer-shell electrons, how the charge on the nitride ion can be predicted from nitrogen's position in the Periodic Table.
Describe how the formula of magnesium nitride can be deduced from the charges on the ions.
Write the balanced equation for the formation of magnesium nitride from its elements, including state symbols.
5 marks, so the mark scheme is looking for about 5 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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