Explain how much portin of an atom located at (a) corner and (b) body centre of a cubic unit cell is part of its neighouring unit cell.

Explanation

An atom at the corner is shared by eight adjacent unit cells. Hence, portion of the atom at ethe corner that belongs to one unit cell `= 1/8` (ii) The atom at the body centre of a cubic unit cell is not shared by any other unit cell. Hence , it belongs fully to the unit cell.