Crystal chemistry & structures

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Last updated 7:32 AM on 4/9/26
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8 Terms

1
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What is a coordination polyhedron?

The geometric arrangement of anions around a cation.

2
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What is the radius ratio?

The ratio of cation radius to anion radius.

3
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What does the radius ratio predict?

The coordination number and polyhedral shape.

4
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What is hexagonal closest packing (hcp)?

ABAB stacking of layers.

5
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What is cubic closest packing (ccp)?

ABCABC stacking of layers.

6
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What is the coordination number in closest packing?

12.

7
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What are Miller indices?

A notation system describing crystal planes.

8
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Name the main symmetry operations.

Rotation, reflection, inversion, translation, rotoinversion.