If an ionic solid has a face-centered cubic lattice of anions (Xn−)and all the octahedral holes are occupied by metal cations (Mm⁺),what is the formula for the compound? A) M₂X B) MX C) MX₂ D) M₂X₃ E) M₃X₂

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In a face-centered cubic lattice of anions, there are 4 anions (Xn−) per unit cell. Since all octahedral holes are occupied by metal cations (Mm+), and there are 4 octahedral holes in a face-centered cubic lattice, the ratio of cations to anions is 1:1, leading to the formula MX.

If an Ionic Solid Has a Face-Centered Cubic Lattice of Anions