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Calcium fluoride forms a crystalline lattice in fluorite. The fluoride ions are the lighter spheres in the unit cell shown. Choose the best description of the interstitial holes that fluoride ions occupy.

Calcium fluoride forms a crystalline lattice in fluorite. The fluoride ions are the lighter spheres in the unit cell shown. Choose the best description of the interstitial holes that fluoride ions occupy.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Calcium fluoride forms a crystalline lattice in fluorite. The fluoride ions are the lighter spheres in the unit cell shown. Choose the best description of the interstitial holes that fluoride ions occupy.

### Explanation of Crystal Structure and Coordination Number: The diagram depicted on the left-hand side of the image showcases a crystal lattice structure of Calcium Fluoride (\(CaF_2\)). In this structure: - The larger grey circles represent \(Ca^{2+}\) ions. - The smaller white circles represent \(F^-\) ions. In the Fluorite structure, each \(Ca^{2+}\) ion is surrounded by eight \(F^-\) ions, forming a cubic coordination. Conversely, each \(F^-\) ion is coordinated by four \(Ca^{2+}\) ions, occupying the tetrahedral holes in the crystal lattice. ### Question and Answer Choices: On the right-hand side of the image, there is a multiple-choice question associated with the depicted structure. The question asks: Which type of void is occupied by the fluoride ions (\(F^-\)) in the given structure? #### Answer Choices: A) Cubic hole B) Tetrahedral hole C) Octahedral hole D) Spherical hole ### Correct Answer: The correct answer is B) Tetrahedral hole. This is because, in the depicted Fluorite (Calcium Fluoride) structure, \(F^-\) ions occupy the tetrahedral voids created by the \(Ca^{2+}\) ions. This configuration ensures the stability and geometry characteristic of the \(CaF_2\) crystal lattice.
Transcribed Image Text:### Explanation of Crystal Structure and Coordination Number: The diagram depicted on the left-hand side of the image showcases a crystal lattice structure of Calcium Fluoride (\(CaF_2\)). In this structure: - The larger grey circles represent \(Ca^{2+}\) ions. - The smaller white circles represent \(F^-\) ions. In the Fluorite structure, each \(Ca^{2+}\) ion is surrounded by eight \(F^-\) ions, forming a cubic coordination. Conversely, each \(F^-\) ion is coordinated by four \(Ca^{2+}\) ions, occupying the tetrahedral holes in the crystal lattice. ### Question and Answer Choices: On the right-hand side of the image, there is a multiple-choice question associated with the depicted structure. The question asks: Which type of void is occupied by the fluoride ions (\(F^-\)) in the given structure? #### Answer Choices: A) Cubic hole B) Tetrahedral hole C) Octahedral hole D) Spherical hole ### Correct Answer: The correct answer is B) Tetrahedral hole. This is because, in the depicted Fluorite (Calcium Fluoride) structure, \(F^-\) ions occupy the tetrahedral voids created by the \(Ca^{2+}\) ions. This configuration ensures the stability and geometry characteristic of the \(CaF_2\) crystal lattice.
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