how many atoms constitute one unit of cell a face-centered cubic crystal?
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8 corner atoms. 6 face atoms. Each corner atom exists in 8 adjacent cells.. so 1/8 of each corner atom is in any particular unit cell. Each face atom exists in 2 adjacent cells. so 1/2 of each face atom is in any given unit cell. total atoms / cell = 8 x 1/8 + 6 x 1/2 = 4.. this model demonstrates that.
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