In NaCl crystal, chloride ions present at the face center are distributed in a _.

Correct answer: D. 2 Unit Cells

  • A. 1 Unit Cell
  • B. 8 Unit Cells
  • C. 4 Unit Cells
  • D. 2 Unit Cells

Explanation

In this structure, each corner ion is shared between eight unit cells, each ion at the center face of the cell is shared by two cells, each ion on the edge by four cells, and the ion inside the cell belongs entirely to that unit cell.

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About Crystal Lattice

A crystal lattice is the regular three-dimensional arrangement of particles in a crystalline solid. The content includes lattice points, unit cells, coordination number, packing patterns, and the differences among ionic, metallic, molecular and covalent network crystals, which should not be confused with amorphous solids.

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