question_answer 13)

Explain how much portion of an atom located at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell. 

Answer:

In a cubic unit cell, an atom at the corner is shared by eight other unit cells. Thus, th part of the atom at the corner is part of its neighboring unit cell. On the other hand, atom located at body-centre of a cubic unit cell is not shared by neighbouring unit cells.