| Related sites for http://en.wikipedia.org/wiki/Argon |
| Dr__Robert_N__Crittenden Essays on the management of land and water sheds in Western Washington State. | | Environment_Agency_of_England_and_Wales UK government agency concerned mainly with rivers, flooding, and pollution. Site includes public information and educational materials, "What's in your backyard?" pollution database, and current flood | | EPA\'s_Surf_Your_Watershed Environmental Protection Agency's service to help citizens locate environmental information about their local regions. Includes atlas of watersheds, how to adopt your local watershed, and watershed in | | EUROCAT_European_Catchments_and_their_Impact_on_the_Coast An EU-funded project that aims to achieve integrated catchment management and sustainable use of water resources at a catchment scale. Focuses on three coastal seas (Mediterranean Sea, Baltic Sea, No | | European_Rivers_Network__RiverNet Mainly European information on river-basins, ecological projects, organizations working on rivers, and threats to rivers. Includes comprehensive page of European river links. Multilingual site. | | Freshwater_Data_Tables__World_Resources_Institute Definitive statistical tables from World Resources 2000-2001 covering Freshwater Resources and Withdrawals, Groundwater and Desalinization, and Major Watersheds of the World. (Tables are in Adobe Acro | | Global_Rivers_Environmental_Education_Network_(GREEN) Award-winning, international education program that involves young people in hands-on river education, conservation, and restoration projects. | | International_Rivers_Network IRN campaigns for sustainable development practices and conservation of rivers and their watersheds throughout the world. | | Montana_Water_Trust A private, nonprofit trust that works cooperatively with landowners to increase tributary flow to benefit Montana's native fish species. | | The_National_Rivers_Website The National Rivers Website provides information on canoeing, kayaking, fly-fishing, rafting, river conservation, river access, and river navigability law. | | National_Weather_Service_Hydrologic_Information_Center Current hydrologic conditions, flood summaries, river forecasts, and related information for the U.S. Also links to other hydrometeorological information resources. | | The_Natural_Tendencies_of_Rivers Essay by J. G. Imhof of Ontario Ministry of Natural Resources. Includes a classification of stream types (with examples from Ontario) and explains how different streams favor different species. | | The_Nile_River Provides facts, maps, photos and information on the Nile river and Cairo. | | NSADP__Northern_Sinai_Agricultural_Development_Program Examines political and environmental issues surrounding a proposed irrigation project in Egypt, the effect on the River Nile, and the possibility of "water wars" between Egypt and other countries who | | Nujiang_Hydrogeography Spatial and temporal analysis of precipitation, temperature and potential evaporation in the Yunnan Upper Salween (Nujiang) River Basin. | | Patapsco_River_Conservation_Project A conservation effort cleaning this Maryland river. Includes a brief history, timeline, famous events, environmental news, updates, photos, and pictures. | | Pilot_Analysis_of_Global_Ecosystems__Freshwater_Systems The World Resources Institute reports that the world's freshwater ecosystems are dangerously degraded. Provided as HTML and PDF. | | Regulated_Rivers__Research_&_Management International journal of interdisciplinary research into river management, including the effects of major dams, weirs, canalization, and water transfers. Free access to abstracts of back issues. | | RestoringRivers_org Information about the National River Restoration Science Synthesis (NRRSS) project, which aims to provide a United States national level synthesis that can be used to inform policy at local, regional, | | Riparian_Buffer_Systems Riparian buffers are established and managed to reduce the impact of adjacent land use. Features information from the Wye Research and Education Center at the University of Maryland. | | Riparian_Management_Systems Information about Riparian Management Systems how they help protect water quality through nitrate, phosphorus, and sediment removal. Site from Iowa State University includes details of project sites, | | River_Network Committed to solving river problems through grassroots citizen action. Works with private land owners and public agencies to acquire and conserve critical areas. Site includes resources for local grou | | River_Research_and_Applications International journal of basic and applied scientific research on biological, ecological, geomorphological, hydrological, engineering and geographical aspects of rivers. Free access to abstracts. | | River_Revival Directory of some grassroots activists and non-governmental organizations engaged in dam decommissioning and river restoration activities, with notes on their particular interests. | | River_Thames__Floating_Down_the_River Wide range of information about the River Thames in England. Includes geology, geography, statistics, navigation, history, pollution, locks, origins of place names, and boat mooring information. | | River_World Dedicated to the conservation and improved management of waterways worldwide. News bulletins and pictures. | | Rivers_of_the_Earth Rivers of the Earth ranked by river length, river system length, drainage basin area, and average discharge rate. | | Rivers_of_the_World__Their_Beauty_and_Majesty Provides comparative ecological and other information about 16 of the world's major rivers: Congo, Mississippi, Columbia, Blackstone, Volga, Ganges, Pawtuxet, Connecticut, Colorado, Amazon, Missouri, | | Stream_Systems_Technology_Center USDA Forest Service organization that develops and implements methdologies for study of stream hydrology. Site provides information about physical aspects of wildland streams, especially fluvial geomo | | Upper_Midwest_Environmental_Sciences_Center_-_About_the_Upper_Mississippi_River_System General description of and information about the 1,300-mile Upper Mississippi River System. Includes heritage, economic, and environmental information and details of current threats faced by the river | | U_S__Geological_Survey_Surface-Water_Field_Techniques_Training_Class Online course provides a basic understanding of techniques the USGS uses to collect streamflow data. | | U_S__Geological_Survey_(USGS)_Cableway_Safety_Training_Class Web-based class describes how cableways are used for measuring stream flow and how to inspect a cableway before it is used. | | U_S__Geological_Survey_(USGS)_Real-Time_Water_Data Links to USGS sites across the United States serving data on real-time streamflow via satellite and modem. | | WWF_Fresh_Waters About this organization's river basin conservation activities and the concerns that motivate them. | | Center_for_Exotic_Species The Center for Exotic Species (CES) is based at Michigan Technological University and is focused on the ecological impacts and potential management of exotic species within the Great Lakes basin as we | | Field_Station_and_Environmental_Education_Center FSEEC is an outdoor classroom that provides opportunities for hands-on learning and observation of Nature and natural processes for students of all ages. Our outdoor laboratories support investigation | | Forestry_Images_-_Invasive_Organisms Collection of imagery of insects, plants, and other organisms invasive to North America. Topics include the organisms, life stages, their damage, and detection/eradication efforts. | | A_F_Ioffe_Physico-Technical_Institute,_Russian_Academy_of_Sciences One of Russia's largest institutions for research in physics and technology. It was founded in 1918 and run for several decades by Abram F. Ioffe. So it is quite natural that the Institute bears the n | | Centre_for_Laser_Plasma_Research A designated research centre and part of the national centre for plasma science and technology (NCPST), located in Dublin City University, Dublin, Ireland | | Czech_Technical_University,_Prague,_Czech_Republic Information on plasma physics groups at CTU and their research projects. |
|
Argon - Wikipedia, the free encyclopedia /**/ /**/ if (wgNotice != '') document.writeln(wgNotice); Argon From Wikipedia, the free encyclopedia Jump to: navigation, search This article is about the chemical element. For other uses, see Argon (disambiguation).18chlorine ← argon → potassiumNe↑Ar↓Kr Periodic table - Extended periodic tableGeneralName, symbol, numberargon, Ar, 18Element categorynoble gasesGroup, period, block18, 3, pAppearancecolourless gasStandard atomic weight39.950(1) g·mol−1Electron configuration[Ne] 3s2 3p6Electrons per shell2, 8, 8Physical propertiesPhasegasDensity(0 °C, 101.325 kPa)1.784 g/LMelting point83.80 K(−189.35 °C, −308.83 °F)Boiling point87.30 K(−185.85 °C, −302.53 °F)Triple point83.8058 K (-189°C), 69 kPaCritical point150.87 K, 4.898 MPaHeat of fusion1.18 kJ·mol−1Heat of vaporization6.43 kJ·mol−1Specific heat capacity(25 °C) 20.786 J·mol−1·K−1Vapor pressureP/Pa1101001 k10 k100 kat T/K 4753617187Atomic propertiesCrystal structurecubic face centeredOxidation states0Electronegativityno data (Pauling scale)Ionization energies(more)1st: 1520.6 kJ·mol−12nd: 2665.8 kJ·mol−13rd: 3931 kJ·mol−1Atomic radius71 pmAtomic radius (calc.)71 pmCovalent radius97 pmVan der Waals radius188 pmMiscellaneousMagnetic orderingnonmagneticThermal conductivity(300 K) 17.72x10-3 W·m−1·K−1Speed of sound(gas, 27 °C) 323 m/sCAS registry number7440–37–1Selected isotopesMain article: Isotopes of argonisoNAhalf-lifeDMDE (MeV)DP36Ar0.337%36Ar is stable with 18 neutrons37Arsyn35 dε0.81337Cl38Ar0.063%38Ar is stable with 20 neutrons39Arsyn269 yβ-0.56539K40Ar99.600%40Ar is stable with 22 neutrons41Arsyn109.34 minβ-2.4941K42Arsyn32.9 yβ-0.60042KReferencesThis box: view • talk • editArgon (pronounced /ˈɑrgɒn/) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present in the Earth's atmosphere at 0.94%. Terrestrially, it is the most abundant and most frequently used of the noble gases. Argon's full outer shell makes it stable and resistant to bonding with other elements. Its triple point temperature of 83.8058 K is a defining fixed point in the International Temperature Scale of 1990.Contents1 Characteristics2 History3 Occurrence4 Isotopes5 Compounds6 Production6.1 Industrial6.2 In radioactive decays7 Applications8 Potential hazards9 References10 Further reading11 External links//[edit] CharacteristicsArgon has approximately the same solubility in water as oxygen gas and is 2.5 times more soluble in water than nitrogen gas. Argon is colorless, odorless, tasteless and nontoxic in both its liquid and gaseous forms. Argon is inert under most conditions and forms no confirmed stable compounds at room temperature.Although argon is a noble gas, it has been found to have the capability of forming some compounds. For example, the creation of argon hydrofluoride (HArF), a metastable compound of argon with fluorine and hydrogen, was reported by researchers at the University of Helsinki in 2000.[1] Although the neutral ground-state chemical compounds of argon are presently limited to HArF, argon can form clathrates with water when atoms of it are trapped in a lattice of the water molecules.[2] Also argon-containing ions and excited state complexes, such as ArH+ and ArF, respectively, are known to exist. Theoretical calculations have shown several argon compounds that should be stable but for which no synthesis routes are currently known.[edit] History  Cavendish's method for the isolation of Argon. The gases are contained in a test-tube (A) standing over a large quantity of weak alkali (B), and the current is conveyed in wires insulated by U-shaped glass tubes (CC) passing through the liquid and rouind the mouth of the test-tube. The inner platinum ends (DD) of the wire receive a current from a battery of five Grove cells and a Ruhmkorff coil of medium size.Argon (Greek meaning "inactive," in reference to its chemical inactivity)[3][4][5] was suspected to be present in air by Henry Cavendish in 1785 but was not discovered until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland in an experiment in which they removed all of the oxygen and nitrogen from a sample of air.[6][7] They had determined that nitrogen produced from chemical compounds was one-half percent lighter than nitrogen from the atmosphere. The difference seemed insignificant, but it was important enough to attract their attention for many months. They concluded that there was another gas in the air mixed in with the nitrogen.[8] Argon was also encountered in 1882 through independent research of H.F. Newall and W.N. Hartley. Each observed new lines in the color spectrum of air but were unable to identify the element responsible for the lines. Argon became the first member of the noble gases to be discovered. The symbol for argon is now Ar, but up until 1957 it was A.[9][edit] Occurrence An argon & mercury vapour discharge tube.Argon constitutes 0.934% by volume and 1.29% by mass of the Earth's atmosphere, and air is the primary raw material used by industry to produce purified argon products. Argon is isolated from air by fractionation, most commonly by cryogenic fractional distillation, a process that also produces purified nitrogen, oxygen, neon, krypton and xenon.[10]The Martian atmosphere in contrast contains 1.6% of argon-40 and 5 ppm of argon-36. The Mariner spaceprobe fly-by of the planet Mercury in 1973 found that Mercury has a very thin atmosphere with 70% argon, believed to result from releases of the gas as a decay product from radioactive materials on the planet. In 2005, the Huygens probe also discovered the presence of argon-40 on Titan, the largest moon of Saturn.[11][edit] IsotopesMain article: Isotopes of argonThe main isotopes of argon found on Earth are 40Ar (99.6%), 36Ar (0.34%), and 38Ar (0.06%). Naturally occurring 40K with a half-life of 1.25×109 years, decays to stable 40Ar (11.2%) by electron capture and positron emission, and also to stable 40Ca (88.8%) via beta decay. These properties and ratios are used to determine the age of rocks.[12]In the Earth's atmosphere, 39Ar is made by cosmic ray activity, primarily with 40Ar. In the subsurface environment, it is also produced through neutron capture by 39K or alpha emission by calcium. 37Ar is created from the decay of 40Ca as a result of subsurface nuclear explosions. It has a half-life of 35 days.[12][edit] CompoundsArgon’s complete octet of electrons indicates full s and p subshells. This full outer energy level makes argon very stable and extremely resistant to bonding with other elements. Before 1962, argon and the other noble gases were considered to be chemically inert and unable to form compounds; however, compounds of the heavier noble gases have since been synthesized. In August 2000, the first argon compounds were formed by researchers at the University of Helsinki. By shining ultraviolet light onto frozen argon containing a small amount of hydrogen fluoride, argon hydrofluoride (HArF) was formed.[13] It is stable up to 40 kelvins (−233 °C).See also: H2-Ar A small piece of rapidly melting argon ice.[edit] Production[edit] IndustrialArgon is produced industrially by the partial distillation of liquid air, a process that separates liquid nitrogen, which boils at 77.3 K, from argon, which boils at 87.3 K and oxygen, which boils at 90.2 K. About 700,000 tons of argon are produced worldwide every year. [14][edit] In radioactive decaysArgon-40, the most abundant isotope of argon, is produced by the decay of potassium-40 with a half-life of 1.26×109 years by electron capture or positron emission. Because of this, it is used in potassium-argon dating to determine the age of rocks.[edit] Applications Cylinders containing argon gas for use in extinguishing fire without damaging server equipmentThere are several different reasons why argon is used in particular applications:An inert gas is needed. In particular, argon is the cheapest alternative when diatomic nitrogen is not sufficiently inert.Low thermal conductivity is required.The electronic properties (ionization and/or the emission spectrum) are necessary.Other noble gases would probably work as well in most of these applications, but argon is by far the cheapest. Argon is inexpensive since it is a byproduct of the production of liquid oxygen and liquid nitrogen, both of which are used on a large industrial scale. The other noble gases (except helium) are produced this way as well, but argon is the most plentiful since it has the highest concentration in the atmosphere. The bulk of argon applications arise simply because it is inert and relatively cheap. Argon is used:As a fill gas in incandescent lighting, because argon will not react with the filament of light bulbs even at high temperatures.As an inert gas shield in many forms of welding, including metal inert gas welding and tungsten inert gas welding. For metal inert gas welding argon is often mixed with CO2.For extinguishing fires where damage to equipment is to be avoided (see photo).As the gas of choice for the plasma used in ICP spectroscopy.As the gas of choice (in ionised form) for sputter coating of specimens for Scanning Electron Microscopy.As a non-reactive blanket in the processing of titanium and other reactive elements.As a protective atmosphere for growing silicon and germanium crystals, and in partial pressure heat treat furnaces.By museum conservators to protect old materials or documents, which are prone to gradual oxidation in the presence of air.[15]To keep open bottles of wine from oxidizing, and in a number of dispensing units and keeper cap systems.To preserve leftover finishes like varnish, polyurethane, paint, and other chemicals during storage. Commercially available in an aerosol can for this purpose (US Patent 6629402).In winemaking to top off barrels, displacing oxygen and thus preventing the wine from turning to vinegar during the aging process.In the pharmaceutical industry to top off bottles of intravenous drug preparations (for example intravenous paracetamol), again displacing oxygen and therefore prolonging the drug's shelf-life.Used to cool the seeker head of the US Air Force version of the AIM-9 Sidewinder missile, and other missiles that use cooled thermal seeker heads. The gas is stored at high pressure, and the expansion of the gas cools the seeker.[16]As an atmosphere in graphite electric furnaces, to keep graphite from oxidizing.As an asphyxiant in the poultry industry, either for mass culling following disease outbreaks, or as a means of slaughter more humane than the electric bath. Argon's relatively high density causes it to remain close to the ground during gassing. Its non-reactive nature makes it suitable in a food product, and since it replaces oxygen at a cellular level in the dead bird, argon also enhances shelf life.[17]As filling of vapour discharge tubes with blue colour .It is used for thermal insulation in energy efficient windows.[18] Argon is also used in technical scuba diving to inflate a dry suit, because it is inert and has low thermal conductivity.[19] It has also used experimentally to replace nitrogen in the breathing or decompression mix, to speed the elimination of dissolved nitrogen from the blood.[20] See Argox (scuba).Argon is also used for the specific way it ionizes and emits light. It is used in plasma globes and calorimetry in experimental particle physics. Blue argon lasers are used in surgery to weld arteries, destroy tumors, and to correct eye defects.[21] In microelectronics, argon ions are used for sputtering.Finally, there are a number of miscellaneous uses. Argon-39, with a half life of 269 years, has been used for a number of applications, primarily ice core and ground water dating. Also, potassium-argon dating is used in dating igneous rocks.Cryosurgery procedures such as cryoablation use liquified argon to destroy cancer cells. In surgery it is used in a procedure called "argon enhanced coagulation" which is a form of argon plasma beam electrosurgery. The procedure carries a risk of producing gas embolism in the patient and has resulted in the death of one person via this type of accident.[22][edit] Potential hazards Please help improve this section by expanding it. Further information might be found on the talk page. (January 2008)Although argon is non-toxic, it does not satisfy the body's need for oxygen and is thus a simple asphyxiant, and, in confined spaces, is known to result in death due to asphyxiation. A recent fatality in Alaska highlights the dangers of argon tank leakage in confined spaces, and emphasizes the need for proper use, storage and handling. Argon is also odorless, tasteless, and colorless, making it hard to perceive.[23] Argon is 25% heavier than air and thus it is considered highly dangerous in closed areas.[edit] References^ "Periodic Table of the Elements: Argon." Lenntech. 2008. Retrieved on September 3, 2007.^ Belosludov, V. R.; O. S. Subbotin, D. S. Krupskii, O. V. Prokuda, and Y. Kawazoe (2006). "Microscopic model of clathrate compounds" (pdf) 1. Institute of Physics (has blown up once in a while) Publishing. Retrieved on 2007-03-08.^ Hiebert, E. N. Historical Remarks on the Discovery of Argon: The First Noble Gas. In Noble-Gas Compounds; Hyman, H. H., Ed.; University of Chicago Press: Chicago, IL, 1963; pp 3–20.^ Travers, M. W. The Discovery of the Rare Gases; Edward Arnold & Co.: London, 1928; pp 1–7.^ Rayleigh, Lord; Ramsay, W. Argon: A New Constituent of the Atmosphere. Chem. News 1895 (February 1), 71, 51–58.^ Lord Rayleigh;William Ramsay (1894 - 1895). "Argon, a New Constituent of the Atmosphere". Proceedings of the Royal Society of London 57 (1): 265–287. doi:10.1098/rspl.1894.0149. http://links.jstor.org/sici?sici=0370-1662%281894%2F1895%2957%3C265%3AAANCOT%3E2.0.CO%3B2-X. ^ William Ramsay. "Nobel Lecture in Chemistry, 1904".^ ABOUT ARGON, THE INERT; The New Element Supposedly Found in the Atmosphere. The New York Times, 3 March 1895^ Holden, Norman E. (12). "History of the Origin of the Chemical Elements and Their Discoverers". National Nuclear Data Center (NNDC).^ "Argon, Ar". Retrieved on 2007-03-08.^ "Seeing, touching and smelling the extraordinarily Earth-like world of Titan". European Space Agency (21).^ a b "40Ar/39Ar dating and errors". Retrieved on 2007-03-07.^ Bartlett, Neil. "The Noble Gases". Chemical & Engineering News.^ "Periodic Table of Elements: Argon – Ar (EnvironmentalChemistry.com)<!- Bot generated title ->". Environmentalchemistry.com. Retrieved on 2008-09-12.^ USA National Archives description of how the Declaration of Independence is stored and displayed. More detail can be found in this more technical explanation, especially Page 4, which talks about the argon keeping the oxygen out.^ Description of Aim-9 Operation^ ""Humane" Poultry Slaughter: Humane Slaughter: Animal Rights vs. Animal Welfare - Downbound.com". Downbound.com. Retrieved on 2008-09-12.^ "Energy-Efficient Windows". Bc Hydro. Retrieved on 2007-03-08.^ Nuckols, Marshall L; Giblo, J; Wood-Putnam, JL (2008). "Thermal characteristics of diving garments when using argon as a suit inflation gas (abstract)". Undersea and Hyperbaric Medicine 35 (4). http://archive.rubicon-foundation.org/7789. Retrieved on 24 October 2008. ^ Pilmanis Andrew A, Balldin UI, Webb James T, Krause KM (December 2003). "Staged decompression to 3.5 psi using argon-oxygen and 100% oxygen breathing mixtures". Aviation, Space, Environmental Medicine 74 (12): 1243–50. PMID 14692466. http://www.ingentaconnect.com/content/asma/asem/2003/00000074/00000012/art00004. Retrieved on 24 October 2008. ^ Fujimoto, James; Rox Anderson, R. (2006). "Tissue Optics, Laser-Tissue Interaction, and Tissue Engineering" 77-88. Biomedical Optics. Retrieved on 2007-03-08.^ "Fatal Gas Embolism Caused by Overpressurization during Laparoscopic Use of Argon Enhanced Coagulation". MDSR (24).^ Middaugh, John; Bledsoe, Gary. "Welder's Helper Asphyxiated in Argon-Inerted Pipe (FACE AK-94-012)." State of Alaska Department of Public Health. June 23, 1994. Retrieved on September 3, 2007.[edit] Further readingLos Alamos National Laboratory – ArgonUSGS Periodic Table - ArgonEmsley, J., Nature’s Building Blocks; Oxford University Press: Oxford, NY, 2001; pp. 35-39.Brown, T. L.; Bursten, B. E.; LeMay, H. E., In Chemistry: The Central Science, 10th ed.; Challice, J.; Draper, P.; Folchetti, N. et al.; Eds.; Pearson Education, Inc.: Upper Saddle River, NJ, 2006; pp. 276 and 289.Triple point temperature: 83.8058 K - Preston-Thomas, H. (1990). "The International Temperature Scale of 1990 (ITS-90)". Metrologia 27: 3–10. doi:10.1088/0026-1394/27/1/002. http://www.bipm.org/en/publications/its-90.html. Triple point pressure: 69 kPa - "Section 4, Properties of the Elements and Inorganic Compounds; Melting, boiling, triple, and critical temperatures of the elements". CRC Handbook of Chemistry and Physics (85th edition ed.). Boca Raton, Florida: CRC Press. 2005. [edit] External links Wikimedia Commons has media related to: Argon Look up argon inWiktionary, the free dictionary.WebElements.com – ArgonDiving applications: Why Argon?Argon Ar Properties, Uses, ApplicationsLeftover Finish Preserver – Bloxygenv • d • eE numbersColors (E100–199) • Preservatives (E200–299) • Antioxidants & Acidity regulators (E300–399) • Thickeners, stabilisers & emulsifiers (E400–499) • pH regulators & anti-caking agents (E500–599) • Flavour enhancers (E600–699) • Miscellaneous (E900–999) • Additional chemicals (E1100–1599)Waxes (E900–909) • Synthetic glazes (E910–919) • Improving agents (E920–929) • Packaging gases (E930–949) • Sweeteners (E950–969) • Foaming agents (E990–999)Calcium peroxide (E930) • Argon (E938) • Helium (E939) • Dichlorodifluoromethane (E940) • Nitrogen (E941) • Nitrous oxide (E942) • Butane (E943a) • Isobutane (E943b) • Propane (E944) • Oxygen (E948) • Hydrogen (E949)v • d • ePeriodic tableH HeLiBe BCNOFNeNaMg AlSiPSClArKCa ScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr YZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgUubUutUuqUupUuhUusUuo Alkali metalsAlkaline earth metalsLanthanoidsActinoidsTransition metalsOther metalsMetalloidsOther nonmetalsHalogensNoble gasesRetrieved from "http://en.wikipedia.org/wiki/Argon" Categories: Chemical elements | Noble gases | ArgonHidden categories: Articles to be expanded since January 2008 | All articles to be expanded Views Article Discussion Edit this page History Personal tools Log in / create account if (window.isMSIE55) fixalpha(); Navigation Main page Contents Featured content Current events Random article Search Interaction About Wikipedia Community portal Recent changes Contact Wikipedia Donate to Wikipedia Help Toolbox What links here Related changesUpload fileSpecial pages Printable version Permanent linkCite this page Languages Afrikaans العربية Asturianu Azərbaycan বাংলা Беларуская Bosanski Български Català Чăвашла Česky Corsu Cymraeg Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Français Furlan Gaelg Galego 한국어 Hawai`i Հայերեն हिन्दी Hrvatski Ido Bahasa Indonesia Íslenska Italiano עברית Basa Jawa ಕನ್ನಡ Kiswahili Kreyòl ayisyen Latina Latviešu Lëtzebuergesch Lietuvių Limburgs Lojban Magyar Македонски മലയാളം Māori मराठी Bahasa Melayu Монгол Nederlands 日本語 Norsk (bokmål) Norsk (nynorsk) Occitan O'zbek ਪੰਜਾਬੀ Plattdüütsch Polski Português Română Runa Simi Русский Shqip Sicilianu Simple English Slovenčina Slovenščina Српски / Srpski Srpskohrvatski / Српскохрватски Seeltersk Suomi Svenska ไทย Tiếng Việt Türkçe Українська 中文   This page was last modified on 5 January 2009, at 00:08. All text is available under the terms of the GNU Free Documentation License. (See Copyrights for details.) Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a U.S. registered 501(c)(3) tax-deductible nonprofit charity. Privacy policy About Wikipedia Disclaimers if (window.runOnloadHook) runOnloadHook(); |
|
