Explain4 marksStandard
Sodium chloride (), magnesium oxide () and calcium fluoride () are ionic compounds. Explain what is meant by ionic bonding. For each compound, state the ions present and describe how these ions are formed from the atoms.
CAIE A Level Chemistry 9701 · Chemical bonding
Chemical bonding: 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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