Skip to main content
Back

Body Centered Cubic Unit Cell quiz

Control buttons has been changed to "navigation" mode.
1/15

Terms in this set (15)

  • How many atoms are present in a body centered cubic (BCC) unit cell?
    There are 2 atoms in a BCC unit cell: one at the center and a total of one from the eight corners combined.
  • Where are the atoms located in a BCC unit cell?
    Atoms are located at each of the eight corners and one atom is at the center of the cube.
  • How much does each corner atom contribute to a single BCC unit cell?
    Each corner atom contributes 1/8 of an atom to the unit cell.
  • What is the formula for the edge length (a) of a BCC unit cell in terms of atomic radius (r)?
    The edge length is a = 4r / √3, where r is the atomic radius.
  • Why is the edge length formula for BCC different from that of a simple cubic unit cell?
    In BCC, atoms do not touch along the edge, creating a small gap, so the edge length is longer compared to a simple cubic unit cell.
  • What is the packing efficiency of a BCC unit cell?
    The packing efficiency of a BCC unit cell is 68%.
  • What does packing efficiency mean in the context of a BCC unit cell?
    Packing efficiency is the percentage of space occupied by atoms in the unit cell.
  • What is the coordination number of a BCC unit cell?
    The coordination number is 8, meaning each atom is surrounded by 8 nearest neighbors.
  • How many corner atoms are there in a BCC unit cell?
    There are 8 corner atoms in a BCC unit cell.
  • How many atoms are contributed by the corner atoms in a BCC unit cell?
    The corner atoms together contribute a total of 1 atom to the unit cell.
  • Is the central atom in a BCC unit cell shared with adjacent unit cells?
    No, the central atom is not shared with any other unit cell.
  • How does the complexity of a unit cell affect its packing efficiency and coordination number?
    As the unit cell becomes more complex, both packing efficiency and coordination number increase.
  • What is the main difference in atom arrangement between a simple cubic and a BCC unit cell?
    A simple cubic has only corner atoms, while BCC has both corner atoms and a central atom.
  • How do you calculate the total number of atoms in a BCC unit cell?
    Add the 1 atom from the corners (8 × 1/8) and the 1 atom at the center for a total of 2 atoms.
  • Why is understanding the BCC structure important in materials science?
    It helps explain the properties of materials with a BCC lattice, such as their density and how atoms are packed.