CBSE
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Class 12
Crystal lattice: A regular arrangement of atoms, molecules or ions in the three-dimensional space.
Only 14 three dimensional lattices are possible called as Bravais Lattices.
Characteristics of crystal lattice:
Seven crystal structure: Cubic, Tetragonal, Orthorhombic, Monoclinic, Hexagonal, Rhombohedral, Triclinic.
Lattice sites (points): The positions which are occupied by the constituent particles in the crystal lattice.
Unit Cell: The smallest repeating portion of a crystal lattice which, when repeated in different direction generates the entire lattice.
A unit cell is characterised by six parameters such as edges: a,b,c and angles: α,β.γ.
Types of Unit cells: It is broadly divided into two categories