Ionic crystal

Ionic crystal

thumb|right|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 crystal consisting of ions bound together by their electrostatic attraction. Examples of such crystals are the alkali halides, including potassium fluoride, potassium chloride, potassium bromide, potassium iodide, sodium fluoride, and other combinations of sodium, caesium, rubidium, or lithium ions with fluoride, bromide, chloride or iodide ions. [web cite|url=http://www.twentyfirstcenturyscience.org/cd/additional-science/c5/teacher/resources/pdf/SSC5_0.pdf|title=Chemicals of the natural environment|accessmonthday=1 February|accessyear=2008] 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. [web cite|url=http://www.chemguide.co.uk/atoms/structures/ionicstruct.html|title=Ionic Structures|accessmonthday=1 February|accessyear=2008] 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. [web cite|url=http://www.twentyfirstcenturyscience.org/cd/additional-science/c5/teacher/resources/pdf/SSC5_0.pdf|title=Chemicals of the natural environment|accessmonthday=1 February|accessyear=2008]

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • ionic crystal — joninis kristalas statusas T sritis Standartizacija ir metrologija apibrėžtis Kristalas, sudarytas iš pakaitomis išsidėsčiusių teigiamųjų ir neigiamųjų jonų. atitikmenys: angl. ionic crystal vok. Ionenkristall, m rus. ионный кристалл, m pranc.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • ionic crystal — joninis kristalas statusas T sritis chemija apibrėžtis Kristalas, kuriame vyrauja joniniai ryšiai. atitikmenys: angl. ionic crystal rus. ионный кристалл …   Chemijos terminų aiškinamasis žodynas

  • ionic crystal — joninis kristalas statusas T sritis fizika atitikmenys: angl. ionic crystal vok. Ionenkristall, m rus. ионный кристалл, m pranc. cristal ionique, m …   Fizikos terminų žodynas

  • ionic crystal — noun a class of crystal consisting of a lattice of ions held together by their electrostatic interaction; they exhibit strong absorption of infrared radiation and have planes along which they cleave easily …   Wiktionary

  • Ionic — or Ionian may refer to:In science: * Ion, in physics and chemistry, an atom or group of atoms with a net electric charge ** Ionic bond, a type of chemical bond involving ions ** Ionic compound, a chemical compound in which ions are held together… …   Wikipedia

  • Ionic bond — [ noble gas electron configuration, and this electron enters the chlorine atom exothermically. The oppositely charged ions are then attracted to each other, and their bonding releases energy. The net transfer of energy is that energy leaves the… …   Wikipedia

  • Ionic radius — The ionic radius, r ion, is a measure of the size of an ion in a crystal lattice. It is measured in either picometres (pm) or Angstrom (Å), with 1 Å = 100 pm. Typical values range from 30 pm (0.3 Å) to over 200 pm (2 Å).The concept of ionic… …   Wikipedia

  • Ionic polarization — In chemistry, ionic polarization is polarization which is caused by relative displacements between positive and negative ions in ionic crystals (for example, NaCl).If crystals or molecules do not consist of only atoms of the same kind, the… …   Wikipedia

  • Crystal structure prediction — (CSP) is the calculation of the crystal structures of solids from first principles. Reliable methods of predicting the crystal structure of a compound, based only on its molecular structure, has been a goal of the physical sciences since the… …   Wikipedia

  • Crystal chemistry — is the study of the principles of chemistry behind crystals and their use in describing structure property relations in solids. The principles that govern the assembly of crystal and glass structures are described, models of many of the… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”