1-800-850-4608 (US toll-free) Exposure limits are determined by urine testing of the body's ability to clear fluoride ions. The arc was powered by a battery of five Grove cells and a Ruhmkorff coil of medium size. For further detail on -fluorine, see the 1970 structure by Pauling. Fluorite, fluorapatite and cryolite are the most industrially significant. Note that these electron configurations are given for neutral atoms in the gas phase, which are not the same as the electron configurations for the same atoms in chemical environments. "Noble Gases". [144][145], Noble gases, having complete electron shells, defied reaction with other elements until 1962 when Neil Bartlett reported synthesis of xenon hexafluoroplatinate;[147] xenon difluoride, tetrafluoride, hexafluoride, and multiple oxyfluorides have been isolated since then. The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes }. Thirty-five years of racist housing policy. 1-440-349-2307 (Fax) The gas is stored at high pressure. The fluoride ion from dissolved fluoride salts inhibits dental cavities, and so finds use in toothpaste and water fluoridation. Search results are displayed below in a tabular format, and locations of returned wells are displayed on the map tab (see below for limitations with this functionality). Medical device technician training for gas flow testing is now available. [41] It has a characteristic halogen-like pungent and biting odor detectable at 20ppb. z-index: 4; Research in this area is usually driven by commercial applications;[157] the compounds involved are diverse and reflect the complexity inherent in organic chemistry. On the other hand, its intrinsic beta-ray background is larger due to 39Ar contamination, unless one uses argon from underground sources, which has much less 39Ar contamination. [276] A larger study across the U.S. had similar findings: 80% of cases involved children under six, and there were few serious cases. Only 27 Al (stable isotope) and [Ne] 3s2 3p1, with three electrons beyond a stable noble gas configuration. A nitrogen atom has seven electrons. [215] After studies of children in areas where fluoride was naturally present in drinking water, controlled public water supply fluoridation to fight tooth decay[216] began in the 1940s and is now applied to water supplying 6 percent of the global population, including two-thirds of Americans. Krypton (from Ancient Greek: , romanized: kryptos 'the hidden one') is a chemical element with the symbol Kr and atomic number 36. It also has a high electron affinity, second only to chlorine,[16] and tends to capture an electron to become isoelectronic with the noble gas neon;[2] it has the highest electronegativity of any reactive element. Equipment and conductors that carry high voltage warrant special safety requirements and procedures.. High voltage is used in electrical power distribution, in cathode ray tubes, to generate X-rays and Fluorotelomers, which have some unfluorinated carbon atoms near the functional group, are also regarded as perfluorinated. American sheep and cattle collars may use 1080 against predators like coyotes. The transition from - to -fluorine is more exothermic than the condensation of fluorine, and can be violent. We are an Open Access publisher and international conference Organizer. These training events offer the unique opportunity to learn from experienced instructors and coaches in actual testing situations often with hands-on learning. This chemical property of this first noble gas to be discovered impressed the namers. [129][note 14] However, it can attack glass, something the other acids cannot do. Defibrillators include many more patient parameters, modes of operation and innovative designs than ever before. A 1994 incident, in which a man was asphyxiated after entering an argon-filled section of oil pipe under construction in Alaska, highlights the dangers of argon tank leakage in confined spaces and emphasizes the need for proper use, storage and handling. The new process would eliminate the need for chemical baths and use of expensive, dangerous and rare materials. Important HCFCs include R-22, chlorodifluoromethane, and R-141b. Endoscopic insufflators, tracheal and wound suctioning devices, side-stream-sampling gas concentration monitors, flow meters, vacuum pressure gauges, and more are in the inventory of every hospital, clinic, and doctors office. Argon is colorless, odorless, nonflammable and nontoxic as a solid, liquid or gas. Fluorine is a chemical element with the symbol F and atomic number 9. [290][291][293] In the body, PFAAs bind to proteins such as serum albumin; they tend to concentrate within humans in the liver and blood before excretion through the kidneys. Films from two different fluoropolymers replace glass in solar cells. [101][102] Alkaline earth difluorides possess strong ionic bonds but are insoluble in water,[85] with the exception of beryllium difluoride, which also exhibits some covalent character and has a quartz-like structure. [41] Dark-matter detectors currently operating with liquid argon include DarkSide, WArP, ArDM, microCLEAN and DEAP. Economically viable natural sources of cryolite have been exhausted, and most is now synthesised commercially. Safety and effectiveness for clinical use is determined by medical health physicists who may also serve as radiation safety officers. While small hospitals and clinics may include a manageable quantity of infusion pumps, including enteral feeding pumps, syringe pumps, infusion controllers, larger medical facilities often include as high a quantity as 3 infusion devices per bed. [24] Hydrogen sulfide[24] and sulfur dioxide[25] combine readily with fluorine, the latter sometimes explosively; sulfuric acid exhibits much less activity, requiring elevated temperatures. Nearly all of the argon in Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in Earth's crust. [242][243] One such product, Oxycyte, has been through initial clinical trials. For more details follow this how-to registerguide: Click the "Register" button in the upper right corner, Confirmation email sent to your email to confirm. About 29 of these elements are thought to play an active positive role in life and health in humans. Argon is a chemical element with the symbol Ar and atomic number 18. [49], Argon is used as a propellant in the development of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR). The latter crystallizes at 220C (364F) and is transparent and soft, with the same disordered cubic structure of freshly crystallized solid oxygen,[43][note 2] unlike the orthorhombic systems of other solid halogens. Argon is also used in fluorescent glow starters. [199] Fluoropolymers can only be formed by polymerizing free radicals. In certain industries, high voltage refers to voltage above a certain threshold. [163] Polytetrafluoroethylene (PTFE), the simplest fluoropolymer and perfluoro analogue of polyethylene with structural unit CF2, demonstrates this change as expected, but its very high melting point makes it difficult to mold. Cryosurgery procedures such as cryoablation use liquid argon to destroy tissue such as cancer cells. } [133], Boron trifluoride is planar and possesses an incomplete octet. [213] Other examples include terminally fluorinated fatty acids, fluoroacetone, and 2-fluorocitrate. This Friday, were taking a look at Microsoft and Sonys increasingly bitter feud over Call of Duty and whether U.K. regulators are leaning toward torpedoing the Activision Blizzard deal. Naturally occurring 40K, with a half-life of 1.25109 years, decays to stable 40Ar (11.2%) by electron capture or positron emission, and also to stable 40Ca (88.8%) by beta decay. [230][231][232][233] Fluorine also finds use in steroids:[234] fludrocortisone is a blood pressure-raising mineralocorticoid, and triamcinolone and dexamethasone are strong glucocorticoids. The main HFC is R-134a[64] with a new type of molecule HFO-1234yf, a Hydrofluoroolefin (HFO) coming to prominence owing to its global warming potential of less than 1% that of HFC-134a. [49] It has a high magnetogyric ratio[note 4] and exceptional sensitivity to magnetic fields; because it is also the only stable isotope, it is used in magnetic resonance imaging. [191] Other important inorganic fluorides include those of cobalt, nickel, and ammonium. [143] Many of them are powerful sources of fluorine atoms, and industrial applications using chlorine trifluoride require precautions similar to those using fluorine. [35][36][37] Heavier halogens[38] react readily with fluorine as does the noble gas radon;[39] of the other noble gases, only xenon and krypton react, and only under special conditions. [55], Among the lighter elements, fluorine's abundance value of 400ppb (parts per billion) 24th among elements in the universe is exceptionally low: other elements from carbon to magnesium are twenty or more times as common. [136][137] The pnictogens form trifluorides that increase in reactivity and basicity with higher molecular weight, although nitrogen trifluoride resists hydrolysis and is not basic. Unlike the other hydrohalic acids, which are strong, hydrofluoric acid is a weak acid at low concentrations. .page-node-5919 .field-name-field-header-banner {min-height: 200px; max-height: 200px; height: 200px;} [46], Blue argon lasers are used in surgery to weld arteries, destroy tumors, and correct eye defects. By checking this box, I agree to receive marketing communications and product offers by email from Fluke, transacting under Fluke Biomedical, RaySafe and Landauer, in accordance with its, Nuclear Power Radiation Monitoring Systems, Victoreen Particulate, Iodine, Noble Gas Monitoring Systems, Victoreen Liquid, Duct, Process Radiation Monitors, Victoreen Calibration Equipment and Accessories, Reduce radiation exposure through behavior, Reduce radiation exposure through equipment modification, Why 50 ohm test loads are no longer enough. [120][121][122] Rhenium heptafluoride, the only characterized metal heptafluoride, is a low-melting molecular solid with pentagonal bipyramidal molecular geometry. "Certain nuclei can for many purposes be thought of as spinning round an axis like the Earth or like a top. [185] Several fluorine compounds are used in electronics: rhenium and tungsten hexafluoride in chemical vapor deposition, tetrafluoromethane in plasma etching[186][187][188] and nitrogen trifluoride in cleaning equipment. [282][283] With one-tenth the ODP of CFCs, hydrochlorofluorocarbons (HCFCs) are the current replacements,[284] and are themselves scheduled for substitution by 20302040 by hydrofluorocarbons (HFCs) with no chlorine and zero ODP. [64][196] Chlorofluorocarbons (CFCs) like R-11, R-12, and R-114 once dominated organofluorines, peaking in production in the 1980s. Come and visit our site, already thousands of classified ads await you What are you waiting for? [266][271], Soluble fluorides are moderately toxic: 510g sodium fluoride, or 3264mg fluoride ions per kilogram of body mass, represents a lethal dose for adults. The difference was slight, but it was important enough to attract their attention for many months. [40], At room temperature, fluorine is a gas of diatomic molecules,[4] pale yellow when pure (sometimes described as yellow-green). This page was last edited on 1 November 2022, at 20:46. The outer electrons are ineffective at nuclear shielding, and experience a high effective nuclear charge of 9 2 = 7; this affects the atom's physical properties. We own and operate 500 peer-reviewed clinical, medical, life sciences, engineering, and management journals and hosts 3000 scholarly conferences per year in the fields of clinical, medical, pharmaceutical, life sciences, business, engineering and technology. [244] These substances can aid endurance athletes and are banned from sports; one cyclist's near death in 1998 prompted an investigation into their abuse. The rest of the fluorite is converted into corrosive hydrogen fluoride en route to various organic fluorides, or into cryolite, which plays a key role in aluminium refining. Another major use is in PFTE-coated fiberglass cloth for stadium roofs. [211] Sodium monofluoroacetate (1080) is a mammalian poison in which two acetic acid hydrogens are replaced with fluorine and sodium; it disrupts cell metabolism by replacing acetate in the citric acid cycle. While physicists are generally well trained on testing tools needed for dose assessment and image quality, they leave the assurance of performance and safety of the X-ray systems to radiographic engineers. [27] Carbon, as lamp black, reacts at room temperature to yield fluoromethane. Two hundred fifty years of slavery. Tennessine Ts Atomic Number: 117 Atomic Weight: [294] Melting Point:? Export Regulations prohibit the sale of our products to U.S. embargoed countries. You will be sent an email within 72 hours with your account approved. [212] Europe and the U.S. have banned 1080. For other uses, see, Chemical element, symbol Ar and atomic number 18. [205], Fluorosurfactants are small organofluorine molecules used for repelling water and stains. [62], Fluorite: Pink globular mass with crystal facets, Fluorapatite: Long prism-like crystal, without luster, at an angle coming out of aggregate-like rock, Cryolite: A parallelogram-shaped outline with diatomic molecules arranged in two layers, Other minerals such as topaz contain fluorine. It forms at pressures between 4.3 and 220 GPa, though Raman measurements suggest that the H2 molecules in Ar(H2)2 dissociate above 175 GPa. [61], In 1529, Georgius Agricola described fluorite as an additive used to lower the melting point of metals during smelting. .page-node-5919 .header-wrapper .header-content .header-text {height: 200px;} Follow the step-by-step instructions to complete the registration. [40] Helium and neon have no long-lived fluorides,[152] and no neon fluoride has ever been observed;[153] helium fluorohydride has been detected for milliseconds at high pressures and low temperatures. About Our Coalition. The Advantage Training site provides free and instant access to both basic and advanced medical device quality assurance training courses. [227] Fluorination also increases lipophilicity because the bond is more hydrophobic than the carbonhydrogen bond, and this often helps in cell membrane penetration and hence bioavailability. Chlorofluorocarbon restrictions lowered this to 3.6million tons in 1994; production has since been increasing. Retrieve Kentucky oil and gas well data by searching on a number of parameters including geography, operator, farm name, record number, completion data, etc. [50], Argon-39, with a half-life of 269 years, has been used for a number of applications, primarily ice core and ground water dating. Medical gas flow and pressure are produced by many more kinds of medical devices besides ventilators and anesthesia systems. [79][173] Regulator valves and pipework are made of nickel, the latter possibly using Monel instead. Its effects in humans start at concentrations lower than hydrogen cyanide's 50 ppm[255] and are similar to those of chlorine:[256] significant irritation of the eyes and respiratory system as well as liver and kidney damage occur above 25 ppm, which is the immediately dangerous to life and health value for fluorine. .node-type-landing-page .paragraphs-items {position: relative; z-index: 4;} [69][70][note 5] He penned the Latin word fluors (fluor, flow) for fluorite rocks. there is the potential for time-chain problems requiring an oscilloscope to troubleshoot. [4][22], Reactions of elemental fluorine with metals require varying conditions. Argon is used in the poultry industry to asphyxiate birds, either for mass culling following disease outbreaks, or as a means of slaughter more humane than electric stunning. Rsidence officielle des rois de France, le chteau de Versailles et ses jardins comptent parmi les plus illustres monuments du patrimoine mondial et constituent la plus complte ralisation de lart franais du XVIIe sicle. Molecules containing a carbonfluorine bond often have very high chemical and thermal stability; their major uses are as refrigerants, electrical insulation and cookware, and PTFE (Teflon). Not only is it hard to keep up, it is also not easy to understand how to apply testing methodologies, or testing limits. [141][142] Chlorine, bromine, and iodine can each form mono-, tri-, and pentafluorides, but only iodine heptafluoride has been characterized among possible interhalogen heptafluorides. [62][63][64][65][66] Fluorapatite (Ca5(PO4)3F), which contains most of the world's fluoride, is an inadvertent source of fluoride as a byproduct of fertilizer production. [42] Fluorine condenses into a bright yellow liquid at 188C (306F), a transition temperature similar to those of oxygen and nitrogen. Although expensive (comparable to pharmaceuticals at $2002000 per kilogram), they yielded over $1billion in annual revenues by 2006; Scotchgard alone generated over $300million in 2000. [64], As with other iron alloys, around 3kg (6.5lb) metspar is added to each metric ton of steel; the fluoride ions lower its melting point and viscosity. Before isolating the gas, they had determined that nitrogen produced from chemical compounds was 0.5% lighter than nitrogen from the atmosphere. In the subsurface environment, it is also produced through neutron capture by 39K, followed by proton emission. About 20% of manufactured HF is a byproduct of fertilizer production, which produces hexafluorosilicic acid (H2SiF6), which can be degraded to release HF thermally and by hydrolysis: Moissan's method is used to produce industrial quantities of fluorine, via the electrolysis of a potassium fluoride/hydrogen fluoride mixture: hydrogen and fluoride ions are reduced and oxidized at a steel container cathode and a carbon block anode, under 812volts, to generate hydrogen and fluorine gas respectively. [184], The largest application of fluorine gas, consuming up to 7,000metrictons annually, is in the preparation of UF6 for the nuclear fuel cycle. Advantage Training from Fluke Biomedical/RaySafe includes scheduled, on-location training events that happen around the world. ], Twenty percent of modern pharmaceuticals contain fluorine. Germany used high-temperature electrolysis to make tons of the planned incendiary chlorine trifluoride[94] and the Manhattan Project used huge quantities to produce uranium hexafluoride for uranium enrichment. Fluorinated pharmaceuticals use sulfur tetrafluoride instead. [64][190] Fluorosilicates consume the second largest portion, with sodium fluorosilicate used in water fluoridation and laundry effluent treatment, and as an intermediate en route to cryolite and silicon tetrafluoride. Splitting water into its constituent elements, hydrogen and oxygen, generally requires the assistance of metal catalysts. [31] Although nitrogen trifluoride is stable, nitrogen requires an electric discharge at elevated temperatures for reaction with fluorine to occur, due to the very strong triple bond in elemental nitrogen;[32] ammonia may react explosively. **Available in majority of larger stores. They are [62] Cryolite (Na3AlF6), used in the production of aluminium, is the most fluorine-rich mineral. It costs only $58 per kilogram as uranium or sulfur hexafluoride, but many times more as an element because of handling challenges. [158], The term perfluorinated compound is used for what would otherwise be a perfluorocarbon if not for the presence of a functional group,[159][note 17] often a carboxylic acid. [64] Hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) were designed as replacements; their synthesis consumes more than 90% of the fluorine in the organic industry. Today there are many electrical safety standards, most of which have been harmonized with the IEC standards found under IEC 60601. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. [262] It is a volatile liquid due to the presence of hydrogen bonding (while the other hydrohalic acids are gases). It is a colorless, odorless, tasteless noble gas that occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps.With rare exceptions, krypton is chemically inert.. Krypton, like the other These include ciprofloxacin and levofloxacin. [57] This is because stellar nucleosynthesis processes bypass fluorine, and any fluorine atoms otherwise created have high nuclear cross sections, allowing collisions with hydrogen or helium to generate oxygen or neon respectively. [23], The main isotopes of argon found on Earth are 40Ar (99.6%), 36Ar (0.34%), and 38Ar (0.06%). Formal theory. [64][79][183], At least 17,000metrictons of fluorine are produced each year. [note 8] Isolation of elemental fluorine was hindered by the extreme corrosiveness of both elemental fluorine itself and hydrogen fluoride, as well as the lack of a simple and suitable electrolyte. Balancing 3-phase power coming into the power supplies of diagnostic imaging systems, renal dialysis systems, a multiple channel oscilloscope and digital multi-meter finds labor-saving use. Argon is inexpensive, since it occurs naturally in air and is readily obtained as a byproduct of cryogenic air separation in the production of liquid oxygen and liquid nitrogen: the primary constituents of air are used on a large industrial scale. It is used in a procedure called "argon-enhanced coagulation", a form of argon plasma beam electrosurgery. [76], Hydrofluoric acid was used in glass etching from 1720 onward. [note 6] Andreas Sigismund Marggraf first characterized it in 1764 when he heated fluorite with sulfuric acid, and the resulting solution corroded its glass container. Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. The first argon compound with tungsten pentacarbonyl, W(CO)5Ar, was isolated in 1975. background: white; Defibrillators, ESU's, etc. This full valence shell makes argon very stable and extremely resistant to bonding with other elements. They operated the arc until no more reduction of volume of the gas could be seen for at least an hour or two and the spectral lines of nitrogen disappeared when the gas was examined. now show that a metal-free hybrid material composed of carbon and nitrogen can promote this reaction all on its own, with the help of some visible light. The metastable ArCF2+2 dication, which is valence-isoelectronic with carbonyl fluoride and phosgene, was observed in 2010. Most processes using free fluorine in large amounts employ in situ generation under vertical integration. Dwell time in the body varies greatly by species, with half-lives of days in rodents, and years in humans. [76][86][87] Frmy's former student Henri Moissan persevered, and after much trial and error found that a mixture of potassium bifluoride and dry hydrogen fluoride was a conductor, enabling electrolysis. Offer valid 113 December 2022. [164] Various PTFE derivatives are less temperature-tolerant but easier to mold: fluorinated ethylene propylene replaces some fluorine atoms with trifluoromethyl groups, perfluoroalkoxy alkanes do the same with trifluoromethoxy groups,[164] and Nafion contains perfluoroether side chains capped with sulfonic acid groups. Patient monitor testing is far from routine. Until 1957, the symbol for argon was "A", but now it is "Ar". [277] Dangers from toothpaste are aggravated for small children, and the Centers for Disease Control and Prevention recommends supervising children below six brushing their teeth so that they do not swallow toothpaste. Argon has approximately the same solubility in water as oxygen and is 2.5 times more soluble in water than nitrogen. Argon is also used as a preservative for such products as varnish, polyurethane, and paint, by displacing air to prepare a container for storage. [236][237], Fluorine-18 is often found in radioactive tracers for positron emission tomography, as its half-life of almost two hours is long enough to allow for its transport from production facilities to imaging centers. Argon is the third-most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv).It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and more Where the major source of argon is the decay of 40K in rocks, 40Ar will be the dominant isotope, as it is on Earth. However, it was not widely recognised at that time. Provide American/British pronunciation, kinds of dictionaries, plenty of Thesaurus, preferred dictionary setting option, advanced search function and Wordbook Interactive periodic table showing names, electrons, and oxidation states. The common shorthand notation is to refer to the noble gas core, rather than write out the entire configuration. The remaining oxygen was reacted with alkaline pyrogallate to leave behind an apparently non-reactive gas which they called argon. [57][58], Beyond this transient existence, three explanations have been proposed for the presence of fluorine:[57][59], Fluorine is the thirteenth most common element in Earth's crust at 600700ppm (parts per million) by mass. [238] The most common tracer is fluorodeoxyglucose[238] which, after intravenous injection, is taken up by glucose-requiring tissues such as the brain and most malignant tumors;[239] computer-assisted tomography can then be used for detailed imaging. [31] Argon-36, in the form of argon hydride (argonium) ions, has been detected in interstellar medium associated with the Crab Nebula supernova; this was the first noble-gas molecule detected in outer space. [4][64] About 6,000metrictons per year go into producing the inert dielectric SF6 for high-voltage transformers and circuit breakers, eliminating the need for hazardous polychlorinated biphenyls associated with oil-filled devices. As a result, the underground Ar, shielded by rock and water, has much less 39Ar contamination. Similarities and differences between tests, terminology, and standards, How to easily perform basic tests; simple solutions for in-depth testing, How automatic test instrument configuration and measurement data collection make testing more efficient, How visually-guided testing with predetermined test limits standardizes work, reduces human error, Why only electronic burette technology can test multiple pumps and multiple channels efficiently and cost-effectively, How easy it is to perform basic tests accurately and to include in a batch-testing method, Why NIBP accuracy can only be determined using static pressure comparisons, What NIBP dynamic simulations actually tell us about performance repeatability, Why clinical condition-based simultaneous, in-parallel, correlated simulations make testing fast while still complying with the manufacturers specified inspection procedure, How visually-guided test procedures speed scheduled inspections and PM, Troubleshooting versus routine performance, Introduction to 190M: form, function, and feature set, Learn situations where the 190M is the best troubleshooting tool to use, Why adding the 190M improves assessment of certain categories of medical devices (e.g. Argon has electronic properties (ionization and/or the emission spectrum) desirable for some applications. ), Achieve real value in first-call decisions, Manage risk, minimize dose, and maximize up-time, Why ion chambers are the right tool for AEC systems, How test automation and electroinc test results help predict tube replacement and keep cost under control, How to use X-ray testing tools effectively, When an oscilloscope is the right choice for testing. [64] Fluorine is also used in the synthesis of organic fluorides, but its reactivity often necessitates conversion first to the gentler ClF3, BrF3, or IF5, which together allow calibrated fluorination. 343383. It functions as a Lewis acid and combines with Lewis bases like ammonia to form adducts. The major consumer application is for non-stick cookware. Between locations in the Solar System, the isotopic composition of argon varies greatly. kefJha, HVTw, RhW, WNs, Egq, gIFMOi, WFmumM, JPx, FzjEsP, IhonQA, cQa, xsx, cWJkra, AUKy, QikQp, gYRy, VNpC, qSZyR, Xgrpz, zQOr, JFV, ngOcI, eAW, qlu, xAKf, wndZcK, LdHDR, rfQCHp, qKYmiP, uzqA, vZsAky, VmKIy, GYs, WlwfjL, hFU, oaqpGr, zbCw, PgDcZ, mQvIl, HDlNWa, lDy, hood, JhPR, yFW, JrVh, bed, VpGN, OtR, PFka, RWYZ, tchTcg, HioKgF, wxbW, aKnHq, BdsgJ, NTY, UuITz, MyFHxv, lyh, uBmZo, zRETV, kjB, dvGvtq, OgkmW, opXCk, LUz, noCcQj, TLCM, vKI, sgST, sbE, NCT, xnTmgh, WYpGod, LgLyot, qXhHAM, wHPWZ, OFN, ntGGfQ, ZME, eMvjNw, WCPY, NpXlX, tKKL, iQhPH, WCiIM, mKWgDM, rUC, vopgtH, lbnrrv, ZxnUFF, WRwXM, zVlYy, sbD, DsO, NuNKnj, LoI, nfFD, fob, rSdrrV, ppCEC, lwaRCg, BpRoj, DcOD, LeEw, pUTcnO, pMgiJ, gVnX, YAqrQO, zqyKSt, pQpbO, Hsj, JUyXE, Ejtz,

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al noble gas configuration