If an ionic compound with the formula MX forms a primitive cubic unit cell with the anions (Xⁿ^-)at the lattice points,the cations (M²ⁿ⁺)will occupy

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Since the anions are at the lattice points in a primitive cubic unit cell, the cations must occupy the cubic hole in the center of each unit cell. This arrangement is known as a simple cubic close packing (SCCP) structure, and it is the most efficient way to pack spheres of equal size. The cations cannot occupy the tetrahedral or octahedral holes since they are too large to fit in those spaces.

If an Ionic Compound with the Formula MX Forms a Primitive