Question

Which of the following is the most symmetrical crystal system for 2-D space lattice?

• A. Hexagonal unit cell
• B. Square unit cell
• C. Rectangular unit cell
• D. Rhombic unit cell

Answer 1

The correct option is B Square unit cell

Square unit cell is the most symmetrical unit cell among the others in 2-D crystal lattice. This is due to the equal symmetry along the digonals of the square cell. The diagonal of the unit cell have same length as the edge length. Thus, gives a equal half along the diagonal. This symmetry in the unit cell is shown below,


Thus, square unit cell is the most symmterical crystal system of 2-D space lattice.