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Chemistry notes for class 12 - Unit Cell And Space Lattices Takshila Learning  is one of the largest growing companies focusing on offering 2D animated courses and recorded lectures by our experienced faculties. Moreover, we offer  Biology, Chemistry, and Physics notes, CBSE guide , last year question papers for board exams preparation. Unit cell is the smallest portion of a crystal lattice which, when repeated in different directions, generates the entire lattice. Each unit cell is defined in terms of  lattice points  – the points in space about which the particles are free to vibrate in a crystal. The position of atoms, molecules, or ions in a solid crystal, relative to one other in space, is usually designated by points. Such a representation is called  space lattice.  Thus, we define the  space lattice  as an array of points showing how molecules, atoms or ions are arranged at different sites in three-dimensional spaces. Unit cells can be broadly divided into two c