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Which of the following statements is not true for the crystal structure of cesium chloride (CsCl)?

 

Option: 1

CsCl has a cubic structure.


Option: 2

Cs^+ and Cl^- ions are arranged in a face-centred cubic lattice.

 


Option: 3

Cs^+ and Cl^- ions have a coordination number of 8 and 6, respectively.


Option: 4

The Cs^+ ions are located at the corners of the cube and Cl^- ions are at the center of the cube.


Answers (1)

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CsCl is an example of a simple cubic crystal lattice, not a face-centred cubic lattice as stated in option 2. In a simple cubic lattice, the unit cell consists of a cube with lattice points located at the corners of the cube. Each lattice point represents one Cs^+ ion. Additionally, there is one Cl^- ion located at the centre of the cube.

In CsCl, each Cs^+ion is surrounded by 8\ Cl^- ions arranged at the corners of a cube around it, resulting in a coordination number of 8 for the Cs^+ ion. On the other hand, each Cl^- ion is surrounded by 6\ Cs^+ ions arranged at the corners of an octahedron around it, resulting in a coordination number of 6 for the Cl^- ion. This is stated in option 3.

Therefore, the correct statement regarding the location of Cs^+ and Cl^- ions in the CsCl crystal structure is that Cs^+ ions are located at the corners of the cube and Cl^- ions are located at the centre of the cube.

Option 4) incorrectly describes the location of the Cl^- ion in the CsCl unit cell.

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Deependra Verma

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