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Q.
Each ion or atom that forms an $fcc$ unit cell is surrounded by
The Solid State
Solution:
In $fcc$ unit cell, a corner atom can support $8$ unit cells. In each cube, at a distance of $\sqrt{3} a / 4$ from corner atom, there is tetrahedral void; it implies each atom is surrounded by eight tetrahedral voids.
At the centre of edge, there is an octahedral void. Each corner can support six edges and hence it is surrounded by six octahedral voids.