What is the number of constituent particles located at the center of the intermolecular unit cell?
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A particle (atom, molecule or ion) which is located at the corners of the lattice, is shared by eight unit cells all in all. Hence the contribution of an atom at the corner to a particular unit cell is one-eighth
An atom on the face of the unit cell is shared by two unit cells. Hence the contribution of a particle at the face to a unit cell is 1/2
The constituent particle at the edge center is shared by four unit cells in the lattice. Hence its contribution to any one particular unit cell is one-fourth
An atom at the body center of a unit cell belongs entirely and only to that unit cell of the lattice. There is no sharing involved
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