7.) A compound crystallizes with cations (A) in a face centered cubic (fcc) lattice with eight anions (X) within the unit cell. What is the formula of the compound? a. AX b. AX2 c. A2X d. A2X3 e. A7X2

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.