2. How to find what a materials crystal structure is? (FCC, BCC or neither FCC or BCC or others)  3. Describe the crystal structure of iron, which crystallizes with two equivalent metal atoms in a cubic unit cell.  4. Silver has a face-centered cubic unit cell. How many atoms of Ag are present in each unit cell?

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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.