Calcium Sulfide Has a Face-Centered Cubic Unit Cell with Calcium

question 74

Multiple Choice

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

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