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

Explain how much portion of an atom at (i) corner and (ii) body-centre

1.	Explain how much portion of an atom at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell.
Answer» Solution :(i)An ATOM at the CORNER is shared by eight adjacent unit CELLS Hence, portion of the atom at the 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