Question

Calcium sulfide has a face-centered cubic unit cell with calcium ions in octahedral holes. How many ions of each element are contained in each unit cell?
A.1 calcium ions; 1 sulfide ions
B.2 calcium ions; 2 sulfide ions
C.2 calcium ions; 4 sulfide ions
D.4 calcium ions; 2 sulfide ions
E.4 calcium ions; 4 sulfide ions

Answer

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