Final answer:The (100) planar of the FCC crystal structure has a coordination number of 12, meaning that each atom is centered on 12 other atoms.Explanation:The face-centered cubic (FCC) crystal structure has a coordination number of 12, meaning that each atom in the (100) plane is centered on 12 other atoms. This can be visualized as each atom being surrounded by a close-packed layer of six atoms in its own plane, three atoms in the layer above, and three atoms in the layer below. Because each atom touches 12 near neighbors, the coordination number is 12....

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