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The void between two oppositly directed ...

The void between two oppositly directed planar triangles of spheres in adjacent layers is called

A

Cubic void

B

Tetrahedral void

C

Octahedral void

D

Tetrahedral (or) Octahedral void

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To solve the question regarding the void between two oppositely directed planar triangles of spheres in adjacent layers, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Structure**: - Visualize the arrangement of spheres in a crystal lattice. In this case, we are considering two layers of spheres where the spheres in one layer are positioned in a way that they create a triangular arrangement. 2. **Identifying the Voids**: - When two layers of spheres are stacked, there are spaces or voids created between them. The question specifically mentions "oppositely directed planar triangles," which indicates that the spheres in the two layers are arranged in a staggered manner. 3. **Determining the Type of Void**: - The void created between two adjacent layers of spheres can be classified based on its geometry. In this case, the void is surrounded by six spheres: three from the upper layer and three from the lower layer. 4. **Recognizing the Octahedral Void**: - The specific arrangement of six surrounding spheres (three above and three below) corresponds to what is known as an **octahedral void**. This is a common type of void found in close-packed structures. 5. **Final Answer**: - Therefore, the void between the two oppositely directed planar triangles of spheres in adjacent layers is called an **octahedral void**.
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