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Topic: Noble gas


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In the News (Mon 22 Jul 19)

  
 Noble gas compound - Wikipedia, the free encyclopedia
Noble gas compounds are (unstable) chemical compounds that include an element from column 18 of the periodic table, the noble gases.
Until the 20th century it was believed that the noble gases could not form compounds due to their full valence shell of electrons that rendered them very chemically stable and unreactive.
Prior to 1962, the main compounds of noble gas known were the hydrates and clathrates.
en.wikipedia.org /wiki/Noble_gas_compound   (653 words)

  
 Noble gas - Wikipedia, the free encyclopedia
The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table.
The name 'noble gases' is an allusion to the similarly unreactive Noble metals, so called due to their preciousness, resistance to corrosion and long association with the aristocracy.
Because of their unreactivity, the noble gases were not discovered until 1868, when helium was detected spectrographically in the Sun.
en.wikipedia.org /wiki/Noble_gas   (571 words)

  
 Kids.net.au - Encyclopedia Noble gas -   (Site not responding. Last check: 2007-10-22)
The term noble gas comes from the fact that, just like the common view of human nobility, these gases generally sit around not doing anything, and avoid reacting with 'common' elements.
In fact, because of their unreactivity, the noble gases were not discovered until the existence of helium was deduced from spectrographic[?] analysis of the sun.
The noble gases also have very weak inter-atomic forces of attraction, and consequently very low melting points and boiling points.
www.kidsseek.com /encyclopedia-wiki/no/Noble_gas   (314 words)

  
 Reactor Analysis: Research Initiatives: Noble Gas Tagging   (Site not responding. Last check: 2007-10-22)
In the gas tagging method, one adds a small amount (nominally 1 ml) of stable noble gas of specified isotopic composition to the helium fill gas of each fuel rod during fabrication.
The development and implementation of noble gas tagging techniques was pursued for use in the EBR-II sodium-cooled fast reactor during the early 1970s, when EBR-II was in use for fuel pin irradiations in support of fast reactor fuel development.
Since gas tag detection is done while at power, it allows the many core-related activities that cannot be initiated until after the leaking assembly has been identified to be undertaken prior to the refueling shutdown.
web.ra.anl.gov /research/ri/ngtag   (619 words)

  
 Noble Gas Isotope Geochemistry: Oil Hydrogeology
Therefore, we believe the source of the excess heavy noble gas component was adsorbed air initially trapped in petroleum source rocks and that this component was expelled and mixed with hydrocarbons during oil-gas expulsion and primary migration.
Apparently, the heavy noble gas-enriched component mixed with the hydrocarbons during oil/gas formation and expulsion is subsequently diluted by noble gases extracted from air saturated groundwater as the oil and gas phases interact with water during secondary migration and storage.
The solid lines are dilution trajectories depicting the change in noble gas composition of oil as it quantitatively extracts noble gases from air saturated groundwater during secondary migration and storage.
www-esd.lbl.gov /CIG/noblegas/oilhydro.html   (718 words)

  
 Chemical Elements.com - Noble Gases   (Site not responding. Last check: 2007-10-22)
The six noble gases are found in group 18 of the periodic table.
These elements were considered to be inert gases until the 1960's, because their oxidation number of 0 prevents the noble gases from forming compounds readily.
All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable.
www.chemicalelements.com /groups/noblegases.html   (70 words)

  
 SAHRA - Isotopes & Hydrology   (Site not responding. Last check: 2007-10-22)
The noble gases are any of the chemically inert elements found on the far right of the periodic table in the helium group.
Noble gases are naturally occurring and present in the earth's atmosphere.
Noble gas concentrations in groundwater samples can currently be measured in several ways: gas chromatography, mass spectrometry, or a combination of both.
www.sahra.arizona.edu /programs/isotopes/noble.html   (1101 words)

  
 New noble gas chemical compounds created as result of Hebrew University research
Until now, the "laws" of chemistry decreed that the noble elements, including the gases helium, neon, argon, krypton, xenon and radon, which are found on the right-hand side of the periodic table, have a special status.
This observation, described towards the end of the 19th century, was explained with the development of quantum theory about 70 years ago, when it was discovered that the inertia of the noble gas atoms derives from their closed and stable electronic shells, which makes these atoms practically impervious to chemical reactions with other atoms.
The combining of noble gas atoms with basic organic molecules (hydrocarbons) is an accomplishment which has aroused great interest in the international chemical community and opens the way for new varieties of chemical derivates utilizing these gases.
www.eurekalert.org /pub_releases/2005-03/huoj-nng032305.php   (453 words)

  
 Reactor Analysis: Research Initiatives: Noble Gas Air   (Site not responding. Last check: 2007-10-22)
The historical application was to announce the existence of leaking fuel pins in sodium-cooled fast reactors by detecting released noble gas fission products or noble gas tags of specified isotopic ratio that had been intentionally placed inside the fuel pin cladding.
It may be a clathrate effect in which the heavy, monatomic noble gas atoms are trapped in the interstitial spaces in the much larger fluid molecules.
Alternatively, the mechanism may be a temperature-dependent solubility phenomenon that fortuitously absorbs and releases the noble gases between the "convenient" temperatures of 20 and 60C.
web.ra.anl.gov /research/ri/ngair   (872 words)

  
 Astronomers Report The First Detection Of A Noble Gas In A Comet   (Site not responding. Last check: 2007-10-22)
This discovery constitutes the first-ever detection of a noble gas in a comet.
Noble gases provide valuable tracers of the thermal history and, therefore, clues to the origins of comets.
Because noble gases do not interact chemically with other elements and because noble gases are easily lost from icy bodies like comets at very low temperatures through processes much like evaporation, their presence or absence provides a way of measuring the thermal history of comets.
www2.jpl.nasa.gov /comet/news109.html   (617 words)

  
 Noble Gas - Free Music Downloads - MP3 Downloads - Download.com Music
Noble Gas was conceived in 1978, in Los Angeles.
Noble Gas appeared at science fiction conventions, rave parties, avant-garde clubs, college concerts, and on the infamous 'Uncle Floyd Show' on local cable a dozen times.
Noble Gas has appeared on two compilation discs on Caprice International Records, with Joey Welz, the keyboardist from Bill Haley and the Comets.
music.download.com /noblegas/3600-8363_32-100309354.html   (712 words)

  
 Noble Gas Isotope Geochemistry: Geothermal Resources
Noble gases (He, Ne, Ar, Kr, and Xe) are definitive tracers for heat and fluid sources.
By convention the elemental and isotopic composition of noble gases in the atmopshere are used as a standard for normalizing noble gas data.
The concentrations of noble gases dissolved in water in equilibrium with air are determined by their temperature dependent solubility.
www-esd.lbl.gov /CIG/noblegas/georesources.html   (2462 words)

  
 The Noble Gas Laboratory at GFZ Potsdam
The noble gases (or "rare gases") helium, neon, argon, krypton, and xenon are chemically inert.
Due to their volatile nature they have a strong tendency to partition into gas or fluid phases and can be used as tracers for the origin and the transport of fluids.
Noble gas isotope systematics of geothermal fluids and lavas from the Central and Southern Volcanic Zones of the Andes
www.gfz-potsdam.de /pb4/pg2/equipment/edelgas/mswebpage.html   (303 words)

  
 Helium, Neon & Argon
It is therefore important to understand the noble gas budget of the Earth, both when it formed and as it aged.
The hot-accretion model of Earth evolution contrasts with the “standard model” of noble gas geochemistry that assumes that the bulk of the mantle accreted in a primordial undegassed state with chondritic, or cosmic, abundances of the noble gas elements.
So-called primitive ratios of noble gas isotopes may be preserved by ancient separation of He and Ne from U+Th and storage of the gas in low-U+Th environments such as depleted lithosphere or olivine cumulates (Anderson, 1998a, 1998b; Natland, 2003).
www.mantleplumes.org /Ne.html   (5203 words)

  
 [No title]
We developed a dual (or two-species) noble gas maser [1-3], the first device to sustain simultaneous active maser oscillations on distinct transitions in two co-located atomic species: the noble gases
In the DNGM, one noble gas species serves as a precision magnetometer to stabilize the system's static magnetic field, while the other species is used as a sensitive probe for new physics such as an EDM.
Schematic diagram of the dual noble gas maser.
cfa-www.harvard.edu /Walsworth/Activities/DNGM/old-DNGM.html   (711 words)

  
 Noble Gas Research
Noble gases are the natural places to study nuclear effects in nature.
Professor Hohenberg developed a new type of mass spectrometer that defines the state of the art noble gas mass spectrometry (Hohenberg, 1980).
They can be studied in the laboratory by laser extraction noble and gas mass spectrometry to reveal the history of energetic particle exposure prior to meteorite formation 4.6 billion years age.
presolar.wustl.edu /work/noblegas.html   (846 words)

  
 EARTHmatters - Spring 1998 - Keck helps launch Noble (Gas) Lab   (Site not responding. Last check: 2007-10-22)
Noble gases do not react with other elements, so they are good chemical indicators.
Right now, the noble gas scientists have wide-ranging projects, such as studying water movement on continents and in oceans, reconstructing ancient continental temperature records using groundwater as an archive, and analyzing gas exchange between the atmosphere and hydrosphere.
Most noble gases are found in concentrations of a parts-per-million (ppm) or smaller scale, so the inlet system they designed had to be sensitive enough to extract minute amounts of noble gases from water and rocks.
www.earthinstitute.columbia.edu /library/earthmatters/spring1998/noblegaslab.html   (1002 words)

  
 Noble Gas Marketing Expands Fuel Management Role
"Noble Gas Marketing's ability to quickly demonstrate flexibility during the negotiation process contributed greatly to being selected as fuel manager for the two independent power plants, which are among the largest in the United States," Burleson stated.
Noble Affiliates, the parent company of Noble Gas Marketing Inc., Samedan Oil Corp., and Noble Trading Inc., is one of the nation's leading independent energy companies.
Noble Affiliates operates throughout major basins in the United States, including the Gulf of Mexico, as well as international operations in Argentina, China, Ecuador, Equatorial Guinea, the Mediterranean Sea, the North Sea and Vietnam.
www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/08-20-2001/0001557885&EDATE=   (460 words)

  
 ScienceDaily: New Noble Gas Chemical Compounds Created
Chemical compounds consisting of noble gases combined with hydrocarbon molecules -- a feat previously thought to be unattainable -- have been created as the result of the work of researchers at the Hebrew University of Jerusalem.
Noble gas -- The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table.
A colorless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionating liquefied air, and is...
www.sciencedaily.com /releases/2005/03/050323115810.htm   (1677 words)

  
 Xenon - Xe - Compressed gas purity, properties and packaging - Xenon is used as a light source in special applications ...
Xenon - Xe - Compressed gas purity, properties and packaging - Xenon is used as a light source in special applications and an important application is as a fill for thyratron and half-wave rectifier tubes.
When a charge of electricity is passed through the gas at low pressure, it emits a flash of bluish-white light; at higher pressures white light resembling daylight is emitted.
Xenon is the least volatile of the noble gases obtainable from the air.
www.c-f-c.com /specgas_products/xenon.htm   (540 words)

  
 Neon - Ne - Neon is used glow lamps, electron tubes, signs, plasma studies, fluorescent starter tubes, cryogenic ...
Neon is a colorless, odorless, and tasteless monatomic gas, belonging to the Group VIIIA elements, called noble gases.
Neon, the name of which is derived from the Greek word neos, "new," is present in some minerals, but its only commercial source is the atmosphere, of which it comprises 18 parts per 1,000,000 by volume.
Colourless, odourless, tasteless, and lighter than air, neon gas occurs in minute quantities in the Earth's atmosphere and trapped within the rocks of the Earth's crust.
www.c-f-c.com /specgas_products/neon.htm   (380 words)

  
 noble gas rule   (Site not responding. Last check: 2007-10-22)
The noble gases are, for all intents and purposes, chemically inert - that is that they do not react.
We can expect that any element or ion that is isoelectronic with a noble gas will also be stable.
This observation is known as the noble gas or "octet" rule.
www.iun.edu /~cpanhd/C101webnotes/chemical-bond/noble-gas-rule.html   (107 words)

  
 Reviews in Mineralogy and Geochemistry
The wide applicability of noble gas systematics is due to the range of such processes.
Studies of the distribution of noble gases within the Earth are a critical component in studies of mantle geochemistry and the formation history of the atmosphere.
Within the crust, noble gases have been key components in studies of crustal evolution, of flow patterns in hydrological systems and ocean basins, and in a range of dating techniques.
www.minsocam.org /MSA/RIM/Rim47.html   (547 words)

  
 Noble Gas Lab
My laboratory consists of a MAP 215-50 noble gas mass spectrometer and associated vacuum systems for the analysis of the abundance and isotopic composition of helium, neon, argon, krypton, and xenon.
A second system, based on a Pfeiffer-Balzers Prisma quadrupole mass spectrometer, is used for high precision noble gas abundance determinations using isotope dilution.
The individual noble gases are then thermally desorbed and analyzed with the mass spectrometers.
www.gps.caltech.edu /~farley/noblegaslab.html   (270 words)

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