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Coordination Number and Number of Atoms Per Unit Cell. A unit cell is the smallest representation of an entire crystal. All crystal lattices are built of repeating unit cells. In a unit cell, an atom's coordination number is the number of atoms it is touching. The simple cubic has a sphere at each corner of a cube.
Structures and Unit Cells of Ionic Materials. This site is a 3D interactive introduction to fundamental crystal structures and unit cells of elemental and ionic materials. It includes simple cubic, body-centered cubic, and cubic and hexagonal close packing unit cells as well as examples showing filling of interstitial holes.
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions.
UNIT CELLS AND CRYSTAL STRUCTURES. Background Information. MOLECULAR STRUCTURES. Crystals. Polymers. Proteins. Cells. THE UNIT CELLS. The unit cell is the simplest repeating unit in a crystal. In a single crystal, all unit cells are identical and oriented the same way (fixed distance and fixed orientation).
Unit Cells: NaCl and ZnS. NaCl should crystallize in a cubic closest-packed array of Cl-ions with Na + ions in the octahedral holes between planes of Cl-ions. We can translate this information into a unit-cell model for NaCl by remembering that the face-centered cubic unit cell is the simplest repeating unit in a cubic closest-packed structure.
