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☛Class 12 chemistry
☛The solid state lesson..
Answers
Answer:
Good evening mate...here's you're answer...
■ Two dimensional close packed structure can be generated by stacking (placing) the rows of close packed spheres.
■ The second row can be placed in contact with the first row in such a way that the spheres of second row are exactly above the first row.
Close-Packed Structures:
■ As we the constituent particles in solid are in form of a sphere. The spheres in solid are arranged in the different way to leave minimum vacant space.
■ These arrangements of spheres in different layers form the closed packed structure of solid. The crystals are formed in the closed packed structure. Similarly, spheres in solid are also arranged in 3-dimension to form close-packed structure.
Close-packing in one-dimension:
Spheres are arranged in a row with touching each other as shown below:
Close-packing in two-dimension:
There are two possible ways to arrange spheres in two dimensions.
Square-closed packing in two dimensions:
The sphere in the first row is exactly aligned with the sphere of the second row.
In this type of arrangement, each sphere is in contact with 4 other sphere that forms a square. The 4 other sphere that is in direct contact with the central sphere is known as nearest neighbour. Since each layer is exactly same, this type of arrangement is known as AAA type of closed packing.
Hexagonal-closed packing in two dimensions:
Spheres in the second row are fit in the depression of first row.
In this type of arrangement, each sphere is in contact with 6 other sphere that forms a hexagon. Here the number of nearest neighbor is 6.
■ The second layer is not exactly aligned exactly with first layer hence it is termed as B. The third layer is aligned exactly with first layer. This type of arrangement is known as ABAB type of closed packing.
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you're answer...
■ Two dimensional close packed structure can be generated by stacking (placing) the rows of close packed spheres.
■ The second row can be placed in contact with the first row in such a way that the spheres of second row are exactly above the first row.
Close-Packed Structures:
■ As we the constituent particles in solid are in form of a sphere. The spheres in solid are arranged in the different way to leave minimum vacant space.
■ These arrangements of spheres in different layers form the closed packed structure of solid. The crystals are formed in the closed packed structure. Similarly, spheres in solid are also arranged in 3-dimension to form close-packed structure.
Close-packing in one-dimension:
Spheres are arranged in a row with touching each other as shown below:
Close-packing in two-dimension:
There are two possible ways to arrange spheres in two dimensions.
Square-closed packing in two dimensions:
The sphere in the first row is exactly aligned with the sphere of the second row.
In this type of arrangement, each sphere is in contact with 4 other sphere that forms a square. The 4 other sphere that is in direct contact with the central sphere is known as nearest neighbour. Since each layer is exactly same, this type of arrangement is known as AAA type of closed packing.
Hexagonal-closed packing in two dimensions:
Spheres in the second row are fit in the depression of first row.
In this type of arrangement, each sphere is in contact with 6 other sphere that forms a hexagon. Here the number of nearest neighbor is 6.
■ The second layer is not exactly aligned exactly with first layer hence it is termed as B. The third layer is aligned exactly with first layer. This type of arrangement is known as ABAB type of closed packing.
hope it helps you mate...hopeithelpsyoumate...
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