We are asked how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.
Zinc blende is a face-centered cubic array of anions and cations occupying one-half of the tetrahedral holes.
Each ion is 4-coordinate and has local tetrahedral geometry.
Show how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.
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