Ionic Crystal
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Ionic Crystal
Sodium chloride (halite) crystal structure. Each atom has six nearest neighbors, with octahedral geometry. This arrangement is known as cubic close packed (ccp).
Light blue = Na+
Dark green = Cl-

An ionic crystal is a crystalline ionic compound. They are solids consisting of ions bound together by their electrostatic attraction into a regular lattice. Examples of such crystals are the alkali halides, including potassium fluoride, potassium chloride, potassium bromide, potassium iodide, sodium fluoride.[1] NaCl has a 6:6 co-ordination. The properties of NaCl reflect the strong interactions that exist between the ions. It is a good conductor of electricity when molten, but very poor in the solid state. When fused the mobile ions carry charge through the liquid.[2] They are characterized by strong absorption of infrared radiation and have planes along which they cleave easily. The exact arrangement of ions in an ionic lattice varies according to the size of the ions in the solid.[3]


  1. ^ "Chemicals of the natural environment" (PDF). Retrieved 2008.[dead link]
  2. ^ "Ionic Structures". Retrieved 2008.
  3. ^ "Chemicals of the natural environment" (PDF). Retrieved 2008.[dead link]

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