ionic size

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• 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 — 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 crystal — 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… …   Wikipedia

• Metal ions in aqueous solution — A metal ion in aqueous solution is a cation, dissolved in water, of chemical formula [M(H2O)n]z+. The solvation number, n, determined by a variety of experimental methods is 4 for Li+ and Be2+ and 6 for elements in rows 3 and 4 of the periodic… …   Wikipedia

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• alkaline-earth metal — /al keuh luyn errth , lin /, Chem. any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals. [1900 05] * * * ▪… …   Universalium

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• actinide element — ▪ chemical element group Introduction       any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). As a group they are significant largely because of their radioactivity.… …   Universalium

• silicate mineral — Any of a large group of silicon oxygen compounds that are widely distributed throughout much of the solar system. The silicates make up about 95% of the Earth s crust and upper mantle, occurring as the major constituents of most igneous rocks and …   Universalium

• Pabstite — is a barium tin titanium silicate mineral that is found in limestone. It belongs to the benitoite group of minerals. The chemical formula of pabstite is Ba(Sn0.77Ti0.23)Si3O9. It is found in Santa Cruz, California. The crystal system of the… …   Wikipedia

• sulfide mineral — or sulphide mineral Any member of a group of compounds of sulfur with one or more metals. The metals that occur most commonly are iron, copper, nickel, lead, cobalt, silver, and zinc. They are the ore minerals of most metals used by industry (e.g …   Universalium