Question

Question 5 of 16 ) Attempt 1 Consider the body-centered cubic unit cell shown in this image. How many corner atoms are shown in the image? number of corner atoms: 8 How many body atoms are shown in the image? number of body atoms: Each body atom is fully inside the boundaries of the cube. What fraction of each corner atom is inside the boundaries of the cube?

Answer 1

=> A Body centered Cusic unit cell is defined as the unit cell in which atoms are present at the eight corners of a Case and one atom is present within the Sody of chit cell. => In three Dimensional View an atom at the Corner is Shared between Bee. eight adjacent unit cells. Thus Contribution of an atom at the corners to a particular unit cell = 1 - Since there are eight corners in a Cusic unit cell. Thus total contribution is given as ell. = I x8 = 1 => An atom present within the Body of imit cell is wholly belonging to the unit celije it is not shared with any other unit con. They the Contribution of Body atom= 100%. Thus tutal Number of atoms in a Bec unit cell = 1 + 1 =12 1 x8 +1 -12 atoms /emit cell.