The physical properties of ionic substances

1 mark · Normal

Which statement best explains why ionic compounds, such as sodium chloride, are often crystalline?

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Correct option: Because the ions are arranged in a regular repeating pattern.

Common mistakes: Choosing 'free to move'; Saying they are made up of molecules

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Marking points

A1 · 1 mark · Chooses: 'Because the ions are arranged in a regular repeating pattern.'

Worked solution

Ionic compounds are crystalline because their ions are arranged in a regular repeating pattern throughout the solid.