Ca (a) 3 8.

Chemistry
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Chapter1: Chemical Foundations
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What is the coordination number of the Cl- ?

### Coordination Number in Crystal Structures

In the image, we observe a 3D model of a crystal structure typical of ionic compounds. The center atom, labeled "Cl," represents a chlorine ion, and the surrounding atoms, labeled "Cs," represent cesium ions, forming a cubic lattice structure known as a cesium chloride (CsCl) structure.

#### Explanation of Diagram:

- **Central Atom (Cl):** This is located at the center of the cube. It is likely represented in green.
- **Surrounding Atoms (Cs):** These are positioned at the eight corners of the cube. They are likely represented in purple.
- **Connecting Lines:** These lines illustrate ionic bonds or the coordination between the central atom and the surrounding atoms.

The question is likely asking for the coordination number of the central atom, which is the number of atoms directly surrounding it.

**Choice Options:**
- 6
- 3
- 8
- 4
- 2

In a cesium chloride structure, the coordination number is 8. Therefore, the correct answer is 8, indicating that each central Cl ion is surrounded by 8 Cs ions, and vice versa.
Transcribed Image Text:### Coordination Number in Crystal Structures In the image, we observe a 3D model of a crystal structure typical of ionic compounds. The center atom, labeled "Cl," represents a chlorine ion, and the surrounding atoms, labeled "Cs," represent cesium ions, forming a cubic lattice structure known as a cesium chloride (CsCl) structure. #### Explanation of Diagram: - **Central Atom (Cl):** This is located at the center of the cube. It is likely represented in green. - **Surrounding Atoms (Cs):** These are positioned at the eight corners of the cube. They are likely represented in purple. - **Connecting Lines:** These lines illustrate ionic bonds or the coordination between the central atom and the surrounding atoms. The question is likely asking for the coordination number of the central atom, which is the number of atoms directly surrounding it. **Choice Options:** - 6 - 3 - 8 - 4 - 2 In a cesium chloride structure, the coordination number is 8. Therefore, the correct answer is 8, indicating that each central Cl ion is surrounded by 8 Cs ions, and vice versa.
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