Explain4 marksStandard
Oxides of the elements sodium to sulfur in Period 3 include , , , and . Explain the trend in the oxidation number of the element combined with oxygen in these oxides, in terms of the electron configurations of the elements.
CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
The Periodic Table: chemical periodicity: explain question
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.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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