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Simple or Primitive,Face Centred or FCC and Body Centred or BCC unit Cell and packing fraction - The Solid State Video Lecture - Class 12

FAQs on Simple or Primitive,Face Centred or FCC and Body Centred or BCC unit Cell and packing fraction - The Solid State Video Lecture - Class 12

1. What is a unit cell in solid state chemistry?
Ans. A unit cell is the smallest repeating unit in a crystal lattice structure. It represents the arrangement of atoms or ions in a crystal lattice and helps in understanding the overall structure of a solid.
2. What do simple or primitive unit cells represent?
Ans. Simple or primitive unit cells represent the basic arrangement of atoms or ions in a crystal lattice. They consist of only one lattice point, which is located at each corner of the unit cell.
3. What is the difference between face-centered (FCC) and body-centered (BCC) unit cells?
Ans. In face-centered (FCC) unit cells, there is one additional lattice point at the center of each face, in addition to the lattice points at each corner. On the other hand, in body-centered (BCC) unit cells, there is one additional lattice point at the center of the unit cell, in addition to the lattice points at each corner.
4. How can the packing fraction be calculated for a unit cell?
Ans. The packing fraction of a unit cell is the ratio of the volume occupied by the atoms or ions in the unit cell to the total volume of the unit cell. It can be calculated by dividing the volume of atoms or ions in the unit cell by the total volume of the unit cell and multiplying by 100%.
5. Why is understanding unit cells and packing fraction important in the study of solid state chemistry?
Ans. Understanding unit cells and packing fraction is important in the study of solid state chemistry because it helps in determining the physical and chemical properties of solids. It provides insights into the arrangement and density of atoms or ions in a crystal lattice, which in turn affects the properties such as conductivity, hardness, and thermal expansion of the solid material.
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