Figure 1. Square and rhombic unit cells in 2D layers. Use the visualization tool, and the discussion and Figure 1 above to answer the following questions. 1. For the simple cubic (SC) lattice structure, what type of 2D unit cell exists in each layer, square or rhombic? 2. For the body-centered cubic (BCC) lattice structure, what type of 2D unit cell exists in each layer, square or rhombic? 3. For the face-centered cubic (FCC) lattice structure, what type of 2D unit cell exists in each layer, square or rhombic? 4. For the hexagonal close-packed (HCP) lattice structure, what type of 2D unit cell exists in each layer, square or rhombic? 5. What is the stacking pattern in the simple cubic lattice structure? aaa, abab, or abcabc? 6. What is the stacking pattern in the body-centered cubic lattice structure? aaa, abab, or abcabc? 7. What is the stacking pattern in the face-centered cubic lattice structure? aaa, abab, or abcabc? 8. What is the stacking pattern in the hexagonal close-packed lattice structure? aaa, abab, or abcabc?

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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.