Discussion
Illite occupies an intermediate position among the clays because its layers are bonded by
Answer: B
Correct answer: potassium ions between the sheets
Illite has the same three-layer structure as montmorillonite but with potassium ions occupying the interlayer space and binding the sheets together. Water cannot readily displace them, so illite swells much less than montmorillonite while remaining more active than kaolinite, whose layers are bonded by hydrogen bonds.
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