The physical properties of ionic substances
2 marks · EasyIonic compounds often form crystals. Explain why the crystalline property is linked to the structure of their ions.
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The repeating, regular arrangement of ions in the lattice forms a crystalline structure.
Also accept: The ions are arranged in a regular, repeating pattern which leads to the formation of crystals.
Common mistakes: Because they are pure; Saying 'because of molecules'
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Marking points
M1 · 1 mark · States ions are arranged in a regular repeating pattern
A1 · 1 mark · Links this arrangement to the crystal shape
Worked solution
Ionic compounds have a giant ionic lattice, with ions arranged in a regular repeating pattern. This causes the solid to be crystalline, as the repeating structure is seen in the shape of the crystals.