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Explain how much portin of an atom locat...

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.

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(i) An atom located at the corner is shared by eight unit cells. Therefore, its contribution to a particular unit cell is `1//8`.
(ii) An atom located at the body of the unit cell is not shared by any unit cell. It belongs to one particular unit cell only.
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