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In hcp arrangement the C.N. of atoms in ...

In hcp arrangement the C.N. of atoms in the middle layer is……

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To find the coordination number (C.N.) of atoms in the middle layer of a hexagonal close-packed (hcp) arrangement, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the HCP Structure**: - The hexagonal close packing (hcp) arrangement consists of layers of atoms stacked in an ABC ABC pattern. This means that the first layer (A) is followed by a second layer (B), then a third layer (C), and this sequence repeats. 2. **Identifying the Middle Layer**: ...
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In hexagonal system of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space -filling model of this structure, called hexagonal close-packed (HCP), is consituted of a sphere on a flat surface surrouneded in the same plane by six identical spheres as closely possible. Three sphere are then palces over the first layer so that they touch each other and represent second layer is covered with third layer that is identical to the bottom layer in relative position. Assume radius of enery sphere to be r. The number of atoms in the HPC unit cell is :

In hexagonal systems of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space-filling model of this structure, called hexagonal close-packed (HCP), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be ‘r’. The volume of this HCP unit cell is