An atom present on the edge is shared by four unit cellsĬontribution of each atom on the edge is 1/4 to the unit cell.īy applying these rules, we can calculate the number of atoms in the different cubic unit cells of monoatomic substances.An atom within the body of the unit cell is shared by no other unit cellĬontribution of each atom within the body is 1 to the unit cell.An atom at the face is a shared by two unit cellsĬontribution of each atom on the face is 1/2 to the unit cell.Hence an atom at the corner contributes 1/8 to the unit cell An atom at the corner is shared by eight unit cells.Keeping the following points in mind we can calculate the number of atoms in a unit cell. Calculation of Number of Particles per Unit Cell of a Cubic Crystal System.
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