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PLANET PLUTO (XENON - XeNo - CURRENT COMPUTER NAME) = THE FATHER = JOHN F. KENNEDY, JR. = GOD #1

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HOW ISIS'S GOT 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA* * *
THE SEED OF LIFE (THE MERCURY SEED) = CAROLINE E. KENNEDY - CAROLINA KENNEDIA*
EVIDENCE OF BEING STALKED FOR SEEDS OF LIFE - CAROLINE E. KENNEDY = ISIS OF 10,000 NAMES
ANNUNICATION OF THE MESSIAH = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
LADY DAY - PERPUTAL VIRGIN MARY - THE MADONNA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
ELECT LADY - THE MADONNA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
MADONNA MAGNETIFICANT = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
SOPHIA OF WISDOM I - PERPUTAL VIRGIN MARY = MARY MAGADALENA OF PETRA & TRIBE OF BENJAMIN
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CENTER OF THE UNIVERSE - ISIS OF 10,000 NAMES - CAROLINE E. KENNEDY
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AGE OF MAKING THE CHRIST GRID - ISIS OF 10,000 NAMES- CAROLINE E. KENNEDY - CAROLINA KENNEDIA
THE MATRIX = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
JESUS CHRIST THE 1ST = SOPHIA OF JESUS CHRIST = THE CHRIST GRID = ISIS CAROLINE ESTELLA KENNEDY
THE PRIME MERIDIAN 0 o = THE CENTER OF THE UNIVERSE = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
STARGATE KEEPER = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
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AGE OF PLANETS - ISIS OF 10000 NAMES = CAROLINE E. KENNEDY
PLANET GAEA = THE MOTHER EARTH = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
THE MOTHER & FATHER BECAME PLANETS & CIRCLED THE EARTH TO MAKE SURE IT WAS CENTERED IN THE UNIVERSE*
PLANET VENUS = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
PLANET JUPITER = JOHN F. KENNEDY,JR = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
PLANET PLUTO (XENON - XeNo - CURRENT COMPUTER NAME) = THE FATHER = JOHN F. KENNEDY, JR. = GOD #1
BACK & FORTH IN TIME - PLANET PLUTO 2 = 1ST COUSIN - DANIEL MACDONALD = GOD #2
BACK & FORTH IN TIME - PLANET PLUTO 3 = 1ST COUSIN - MICHAEL MORAN = GOD #3
BACK & FORTH IN TIME - PLANET PLUTO 4 = 1ST COUSIN - JEFFERY HANKS = GOD #4
BACK & FORTH IN TIME - PLANET PLUTO 5 = 1ST COUSIN - PETER MORAN = GOD #5
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GALAXIES = ISIS OF 10000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
GALAXY - CALLISTO (MOTHER OF ARTHUR THE BEAR = (ARISTOBULUS III = KING OF THE JEWS) = URSA MAJOR
ENKI'S KIDS RETURN TO BECOME STARS - JOHAN - CLAYTON - AVA = URSA MINOR = ISIS OF 10,000 NAMES
AGE OF GEMINI - ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
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MOONS = ISIS OF 10000 NAMES - CAROLINE E. KENNEDY - CAROLINA KENNEDIA
MOON - CALLISTO = EURGAINE = KING ARTHUR'S MOTHER = CAMELOT - ISIS OF 10,000 NAMES = CAROLINE E. KEN
MOON - EURPOA = EUROPA & THE SEA BULL = ISIS OF 10,000 NAMES = CAROLINE E. & JOHN KENNEDY, JR
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DEVELOPING COUNTRIES = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
LEMURIA = 35,000,000 MILLION YEARS = THE CRADLE OF MANKIND = PARADISE = ISIS OF 10,000 - CAROLINE E.
INDIAN NATION = LEMURIA - AMERICA = 35,000,000 MILLION YEARS = ISIS OF 10,000 NAMES
ATLANTIS = 35,000,000 MILLION YEARS = ISIS OF 10,000 NAMES
EUROPA = EUROPE = 35,000,000 MILLION YEARS = ISIS OF 10,000 NAMES
ASIA MAJOR = ASIA = 35,000,000 MILLION YEARS = ISIS OF 10,000 NAMES
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HOLIDAYS = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
MOTHER'S DAY = VENUS - JUN 17TH & FATHER'S DAY = JUPITER - JUN 18TH=ISIS OF 10,000 NAMES=CAROLINE
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HIGHEST OF THE HIGH OF ALL BEAST MASTERS = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
DORIS THE TITAN = MERMAID = DORIC GREEK = VALENTINA DORIA I II III = CAROLINE E. KENNEDY
BACK & FORTH IN TIME - LEVIATHAN = SEA MONSTER CREATED BY A STRANGE CANAANITE BAAL
BACK & FORTH IN TIME - PEGAN RELIGION - LEVIATHAN - SLEEPING SPELL - PROTECTING ATLANTIS
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COINS = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
COIN = SACAJAWEA & JOHN BAPTISTE = CAROLINE E. & JOHN F. KENNEDY, JR**********
COIN = JOHN F. KENNEDY, JR. STATE QUARTER = CAROLINE E. & JOHN F. KENNEDY, JR**
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AGE OF GODDESSES = ISIS OF 10000 NAMES
THE GOD OF ALL THE GODS = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
GODDESS OF SACRED GEOMETRY = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
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AGE OF HOLY SPIRITS = ISIS 0F 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINE KENNEDIA
THE MAGDALENE GRAIL = CAMELOT = THE MADONNA = PERPUTAL VIRGIN MARY = HOLY SPIRIT****
GODDESS MAMI OF THE ALTRA HASIS = ISIS OF 10,000 NAMES = CAROLYN BESSETTE NOT CAROLINE E. KENNEDY
IST SPEAR OF DESTINY = GOD OF WISDOM = EZRA = CAROLINE E. KENNEDY & ETHAN HANKS = HOLY GHOST***
GODDESS THE FIRST WOMAN = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
GODDESS NEKHBET & VULTURE GODDESS = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
GODDESS NEBHET HOTEP = ISIS OF 10,000 NAMES = CAROLYN BESSETTE KENNEDY NOT CAROLINE E. KENNEDY
GODDESS DRAGON QUEEN - ASSA - URU = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
GODDESS SUMERIAN LULU = CAROLYN BESSETTE KENNEDY
GODDESS MA'AT - DIVINE ORDER & TRUTH = ISIS OF 10,000 NAMES=CAROLINE E. KENNEDY - CAROLINA KENNEDIA
GODDESS HERA 1 = CALLISTO = CAROLINE E. KENNEDY - CAROLINA KENNEDIA***
GODDESS HERA 2 = ISIS OF 10,000 NAMES = SHARI BROCECK NOT CAROLINE E. KENNEDY
GODDESS PERSPHONE = MATER = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
GODDESS ALEXANDRA OF PETRA = THE HOLY GRAIL = CAMELOT = CAROLINE E. KENNEDY
GODDESS PSYCHE = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
GODDESS CALISTO = EUGRAINE = MOTHER OF KING ARTHUR = CAMELOT
GODDESS EUROPA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
GODDESS LEDA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
GODDESS ANDROMACHE OF TROY = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
GODDESS THE MAYAN WOMAN = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
GODDESS NINMESARA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
GODDESS NINHURSAG = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
GODDESS QADASHU = CAROLINE E. KENNEDY - CAROLINA KENNEDIA*****
GODDESS IUSAS = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
STATUE OF LIBERTY****
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AGE OF QUEENS = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
THE FEMALE KING - MA'AT - KA - RA HATSHEPSUT = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
QUEEN CLEOPATRA OF EYGPT = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
QUEEN OF THE ANGELS BY THE SEA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
QUEEN CLEOPATRA OF NEW JERUSALEM = CAROLINE E. KENNEDY - CAROLINA KENNEDIA***
MARY QUEEN OF SCOTS = CAROLINE E. KENNEDY - CAROLINA KENNEDIA*
QUEEN CINDERALLA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
QUEEN OF THE FOLLIES FANNY BRICE = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
SCOTTISH LINE TO THE THRONE OF ENGLAND - CANADA - NEW ZEALAND = CRIVELLI - VISCONTI - STUART*****
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AGE OF DUCHESSES OF MILAN = ISIS OF 10000 NAMES
DUCHESS VALENTINA DORIA CRIVELLI - VISCONTI I II III = CAROLINE E. KENNEDY*
MONA LISA - DUCHESS OF MILAN = CAROLINE E. KENNEDY - CAROLINA KENNEDIA*
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AGE OF PRINCESSES
PRINCESS SNOW WHITE = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
PRINCESS SACAJAWEA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA ****
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AGE OF LADIES - ISIS OF 10000 NAMES
LADY OF THE WEAVING = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
LADY RAYET = ENKI = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
LADY SHALOTT = QUEEN GWENDOLEN OF CAMELOT = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
FIRST LADY - JACQUELINE B. KENNEDY II = CAMELOT = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
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AGE OF SAINTS = ISIS OF 10000 NAMES
SOPHIA OF WISDOM = CAROLINE E. KENNEDY - CAROLINA KENNEDIA = ISIS OF 10,000 NAMES
SOPHIA BARBELO = CAROLINE E. KENNEDY - CAROLINA KENNEDIA*******
THE SOPHIA OF ALL THE SOPHIA OF WISDOMS *= CAROLINE E. KENNEDY - CAROLINA KENNEDIA***
SOPHIA OF WISDOM II = MOTHER ANN LEE II = UNIVERSAL LEADER = HOLY SPIRIT TO ALL AMERICAN PRESIDENTS
SOPHIA OF WISDOM III = CAROLINE E. KENNEDY - CAROLINA KENNEDIA***
SAINT JOAN OF ARC****
POPE JOAN****
ISIS THE ARC OF THE COVENANT & POPE JOHN PAUL = KAROL = CAROLINE E. KENNEDY - CAROLINA KENNEDIA**
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AGE OF THE END OF JUDGEMENTS = ISIS OF 10000 NAMES
HIGHEST OF THE HIGH OF ALL DOMINION ANGELS = *CAROLINE E. KENNEDY - CAROLINA KENNEDIA***
HIGHEST OF THE HIGH OF ALL LORDS OF KARMA = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
HER HONOR VALENTINA DORIA I II III OF THE SUPREME COURT OF THE PARANORMAL = ISIS OF 10,000 NAMES
THE OMEGA = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
SUPREME CHAIRPERSON OF THE LORDS OF KARMA COUNSEL = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY
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AGE OF BUSINESSES = ISIS OF 10000 NAMES
ANCIENT BEADS & ARTIFACTS = ISIS OF 10,000 NAMES - CAROLINE KENNEDY
THE HOLY GRAIL OF ALL SALSAS = CRIVELLI ITALIAN SALSA = CAROLINE E. KENNEDY - CAROLINA KENNEDIA****
FOUNDER OF CRIVELLI ITALIAN SALA - CAROLINE E. KENNEDY****
PARANORMAL INVESTIGATOR = ISIS OF 10,000 NAMES = CAROLINE E. KENNEDY - CAROLINA KENNEDIA
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SOPHIA OF WISDOM III - ANGELS & DEMONS 2


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SOPHIA OF WISDOM III - ANGELS & DEMONS 3


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Xenon (pronounced /ˈzɛnɒn/[2] or /'ziːnɒn/[3]) is the chemical element that has the symbol Xe and atomic number 54. A colorless, heavy, odorless noble gas, xenon occurs in the earth's atmosphere in trace amounts.[4] Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.[5][6][7]

Naturally occurring xenon consists of nine stable isotopes. There are also over 40 unstable isotopes that undergo radioactive decay. The isotope ratios of xenon are an important tool for studying the early history of the Solar System.[8] Xenon-135 is produced as a result of nuclear fission and acts as a neutron absorber in nuclear reactors.[9]

Xenon is used in flash lamps[10] and arc lamps,[11] and as a general anesthetic.[12] The first excimer laser design used a xenon dimer molecule (Xe2) as its lasing medium,[13] and the earliest laser designs used xenon flash lamps as pumps.[14] Xenon is also being used to search for hypothetical weakly interacting massive particles[15] and as the propellant for ion thrusters in spacecraft.[16]

History

Xenon was discovered in England by William Ramsay and Morris Travers on July 12, 1898, shortly after their discovery of the elements krypton and neon. They found it in the residue left over from evaporating components of liquid air.[17][18] Ramsay suggested the name xenon for this gas from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning 'foreign(er)', 'strange(r)', or 'guest'.[19][20] In 1902, Ramsay estimated the proportion of xenon in the Earth's atmosphere as one part in 20 million.[21]

During the 1930s, engineer Harold Edgerton began exploring strobe light technology for high speed photography. This led him to the invention of the xenon flash lamp, in which light is generated by sending a brief electrical current through a tube filled with xenon gas. In 1934, Edgerton was able to generate flashes as brief as one microsecond with this method.[10][22][23]

In 1939 Albert R. Behnke Jr. began exploring the causes of "drunkenness" in deep-sea divers. He tested the effects of varying the breathing mixtures on his subjects, and discovered that this caused the divers to perceive a change in depth. From his results, he deduced that xenon gas could serve as an anesthetic. Although Lazharev, in Russia, apparently studied xenon anesthesia in 1941, the first published report confirming xenon anesthesia was in 1946 by J. H. Lawrence, who experimented on mice. Xenon was first used as a surgical anesthetic in 1951 by Stuart C. Cullen, who successfully operated on two patients.[24]

In 1960 physicist John H. Reynolds discovered that certain meteorites contained an isotopic anomaly in the form of an overabundance of xenon-129. He inferred that this was a decay product of radioactive iodine-129. This isotope is produced slowly by cosmic ray spallation and nuclear fission, but is produced in quantity only in supernova explosions. As the half-life of 129I is comparatively short on a cosmological time scale, only 16 million years, this demonstrated that only a short time had passed between the supernova and the time the meteorites had solidified and trapped the 129I. These two events (supernova and solidification of gas cloud) were inferred to have happened during the early history of the Solar System, as the 129I isotope was likely generated before the Solar System was formed, but not long before, and seeded the solar gas cloud isotopes with isotopes from a second source. This supernova source may also have caused collapse of the solar gas cloud. [25][26]

Xenon and the other noble gases were for a long time considered to be completely chemically inert and not able to form compounds. However, while teaching at the University of British Columbia, Neil Bartlett discovered that the gas platinum hexafluoride (PtF6) was a powerful oxidizing agent that could oxidize oxygen gas (O2) to form dioxygenyl hexafluoroplatinate (O2+[PtF6]).[27] Since O2 and xenon have almost the same first ionization potential, Bartlett realized that platinum hexafluoride might also be able to oxidize xenon. On March 23, 1962, he mixed the two gases and produced the first known compound of a noble gas, xenon hexafluoroplatinate.[28][7] Bartlett thought its composition to be Xe+[PtF6], although later work has revealed that it was probably a mixture of various xenon-containing salts.[29][30][31] Since then, many other xenon compounds have been discovered,[32] and some compounds of the noble gases argon, krypton, and radon have been identified, including argon fluorohydride (HArF),[33] krypton difluoride (KrF2),[34][35] and radon fluoride.[36]

Occurrence

Xenon is a trace gas in Earth's atmosphere, occurring at 0.087±0.001 parts per million (μL/L),[37] and is also found in gases emitted from some mineral springs. Some radioactive species of xenon, for example, 133Xe and 135Xe, are produced by neutron irradiation of fissionable material within nuclear reactors.[5]

Xenon is obtained commercially as a byproduct of the separation of air into oxygen and nitrogen. After this separation, generally performed by fractional distillation in a double-column plant, the liquid oxygen produced will contain small quantities of krypton and xenon. By additional fractional distillation steps, the liquid oxygen may be enriched to contain 0.1–0.2% of a krypton/xenon mixture, which is extracted either via adsorption onto silica gel or by distillation. Finally, the krypton/xenon mixture may be separated into krypton and xenon via distillation.[38][39] Extraction of a liter of xenon from the atmosphere requires 220 watt-hours of energy.[40] Worldwide production of xenon in 1998 was estimated at 5,000–7,000 m3.[41] Due to its low abundance, xenon is much more expensive than the lighter noble gases—approximate prices for the purchase of small quantities in Europe in 1999 were 10 /L for xenon, 1 €/L for krypton, and 0.20 €/L for neon.[41]

Xenon is relatively rare in the Sun's atmosphere, on Earth, and in asteroids and comets. The atmosphere of Mars shows a xenon abundance similar to that of Earth: 0.08 parts per million,[42] however Mars shows a higher proportion of 129Xe than the Earth or the Sun. As this isotope is generated by radioactive decay, the result may indicate that Mars lost most of its primordial atmosphere, possibly within the first 100 million years after the planet was formed.[43][44] By contrast, the planet Jupiter has an unusually high abundance of xenon in its atmosphere; about 2.6 times as much as the Sun.[45] This high abundance remains unexplained and may have been caused by an early and rapid buildup of planetesimals—small, subplanetary bodies—before the presolar disk began to heat up.[46] (Otherwise, xenon would not have been trapped in the planetesimal ices.) Within the Solar System, the nucleon fraction for all isotopes of xenon is 1.56 × 10-8, or one part in 64 million of the total mass.[47] The problem of the low terrestrial xenon may potentially be explained by covalent bonding of xenon to oxygen within quartz, hence reducing the outgassing of xenon into the atmosphere.[48]

Unlike the lower mass noble gases, the normal stellar nucleosynthesis process inside a star does not form xenon. Elements more massive than iron-56 have a net energy cost to produce through fusion, so there is no energy gain for a star to create xenon.[49] Instead, many isotopes of xenon are formed during supernova explosions.[50]

Characteristics

An electron shell diagram for xenon. Note the eight electrons in the outer shell.

An atom of xenon is defined as having a nucleus with 54 protons. At standard temperature and pressure, pure xenon gas has a density of 5.761 kg/m3, about 4.5 times the surface density of the Earth's atmosphere, 1.217 kg/m3.[51] As a liquid, xenon has a density of up to 3.100 g/mL, with the density maximum occurring at the triple point.[52] Under the same conditions, the density of solid xenon, 3.640 g/cm3, is larger than the average density of granite, 2.75 g/cm3.[52] Using gigapascals of pressure, xenon has been forced into a metallic phase.[53]

Xenon is a member of the zero-valence elements that are called noble or inert gases. It is inert to most common chemical reactions (such as combustion, for example) because the outer valence shell contains eight electrons. This produces a stable, minimum energy configuration in which the outer electrons are tightly bound.[54] However, xenon can be oxidized by powerful oxidizing agents, and many xenon compounds have been synthesized.

In a gas-filled tube, xenon emits a blue or lavenderish glow when the gas is excited by electrical discharge. Xenon emits a band of emission lines that span the visual spectrum,[55] but the most intense lines occur in the region of blue light, which produces the coloration.[56]

Isotopes

Main article: Isotopes of xenon

Naturally occurring xenon is made of nine stable isotopes. The isotopes 124Xe, 134Xe and 136Xe are predicted to undergo double beta decay, but this has never been observed so they are considered to be stable.[57][58] Besides these stable forms, there are over 40 unstable isotopes that have been studied. 129Xe is produced by beta decay of 129I, which has a half-life of 16 million years, while 131mXe, 133Xe, 133mXe, and 135Xe are some of the fission products of both 235U and 239Pu,[59] and therefore used as indicators of nuclear explosions. The various isotopes of xenon are produced from supernova explosions,[50] red giant stars that have exhausted the hydrogen at their cores and entered the asymptotic giant branch, classical novae explosions[60] and the radioactive decay of elements such as iodine, uranium and plutonium.[59]

The artificial isotope 135Xe is of considerable significance in the operation of nuclear fission reactors. 135Xe has a huge cross section for thermal neutrons, 2.6×106 barns,[9] so it acts as a neutron absorber or "poison" that can slow or stop the chain reaction after a period of operation. This was discovered in the earliest nuclear reactors built by the American Manhattan Project for plutonium production. Fortunately the designers had made provisions in the design to increase the reactor's reactivity (the number of neutrons per fission that go on to fission other atoms of nuclear fuel).[61] 135Xe reactor poisoning played a major role in the Chernobyl disaster.[62]

Under adverse conditions, relatively high concentrations of radioactive xenon isotopes may be found emanating from nuclear reactors due to the release of fission products from cracked fuel rods,[63] or fissioning of uranium in cooling water.[64]

Because xenon is a tracer for two parent isotopes, xenon isotope ratios in meteorites are a powerful tool for studying the formation of the solar system. The iodine-xenon method of dating gives the time elapsed between nucleosynthesis and the condensation of a solid object from the solar nebula. Xenon isotopic ratios such as 129Xe/130Xe and 136Xe/130Xe are also a powerful tool for understanding terrestrial differentiation and early outgassing.[8] Excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle-derived gases soon after Earth's formation.[65][59]

Compounds

See also: Category:Xenon compounds

Xenon hexafluoroplatinate was the first chemical compound of xenon, synthesized in 1962.[28] Following this, many additional compounds of xenon have been discovered. These include xenon difluoride (XeF2), xenon tetrafluoride (XeF4), xenon hexafluoride (XeF6), xenon tetroxide (XeO4), and sodium perxenate (Na4XeO6). A highly explosive compound, xenon trioxide (XeO3), has also been made. Most of the more than 80[66][67] xenon compounds found to date contain electronegative fluorine or oxygen. When other atoms are bound (such as hydrogen or carbon), they are often part of a molecule containing fluorine or oxygen.[68] Some compounds of xenon are colored but most are colorless.[66]

In 1995, a group of scientists at the University of Helsinki in Finland (M. Räsänen and co-workers) announced the preparation of xenon dihydride (HXeH), and later xenon hydride-hydroxide (HXeOH), hydroxenoacetylene (HXeCCH), and other Xe-containing molecules. [69][70] Additionally, in 2008 Khriachtchev et al. reported the preparation of HXeOXeH by the photolysis of water within a cryogenic xenon matrix.[71] Deuterated molecules, HXeOD and DXeOH, have also been produced.[72]

XeF4 crystals. 1962.
XeF4 crystals. 1962.

As well as compounds where xenon forms a chemical bond, xenon can form clathrates—substances where xenon atoms are trapped by the crystalline lattice of another compound. An example is xenon hydrate (Xe·5.75 H2O), where xenon atoms occupy vacancies in a lattice of water molecules.[73] The deuterated version of this hydrate has also been produced.[74] Such clathrate hydrates can occur naturally under conditions of high pressure, such as in Lake Vostok underneath the Antarctic ice sheet.[75] Clathrate formation can be used to fractionally distill xenon, argon and krypton.[76] Xenon can also form endohedral fullerene compounds, where a xenon atom is trapped inside a fullerene molecule. The xenon atom trapped in the fullerene can be monitored via 129Xe nuclear magnetic resonance spectroscopy. Using this technique, chemical reactions on the fullerene molecule can be analyzed, due to the sensitivity of the chemical shift of the xenon atom to its environment. However, the xenon atom also has an electronic influence on the reactivity of the fullerene.[77]

Applications

Although xenon is rare and relatively expensive to extract from the Earth's atmosphere, it still has a number of applications.

Illumination and optics

Gas-discharge lamps

Xenon is used in light-emitting devices called xenon flash lamps, which are used in photographic flashes and stroboscopic lamps;[10] to excite the active medium in lasers which then generate coherent light;[78] and, occasionally, in bactericidal lamps.[79] The first solid-state laser, invented in 1960, was pumped by a xenon flash lamp,[14] and lasers used to power inertial confinement fusion are also pumped by xenon flash lamps.[80]

Xenon short-arc lamp.
Xenon short-arc lamp.

Continuous, short-arc, high pressure xenon arc lamps have a color temperature closely approximating noon sunlight and are used in solar simulators. That is, the chromaticity of these lamps closely approximates a heated black body radiator that has a temperature close to that observed from the Sun. After they were first introduced during the 1940s, these lamps began replacing the shorter-lived carbon arc lamps in movie projectors.[11] They are employed in typical 35mm and IMAX film projection systems, automotive HID headlights and other specialized uses. These arc lamps are an excellent source of short wavelength ultraviolet radiation and they have intense emissions in the near infrared, which is used in some night vision systems.

The individual cells in a plasma display use a mixture of xenon and neon that is converted into a plasma using electrodes. The interaction of this plasma with the electrodes generates ultraviolet photons, which then excite the phosphor coating on the front of the display.[81][82]

Xenon is used as a "starter gas" in high pressure sodium lamps. It has the lowest thermal conductivity and lowest ionization potential of all the non-radioactive noble gases. As a noble gas, it does not interfere with the chemical reactions occurring in the operating lamp. The low thermal conductivity minimizes thermal losses in the lamp while in the operating state, and the low ionization potential causes the breakdown voltage of the gas to be relatively low in the cold state, which allows the lamp to be more easily started.[83]

Lasers

In 1962, a group of researchers at Bell Laboratories discovered laser action in xenon,[84] and later found that the laser gain was improved by adding helium to the lasing medium.[85][86] The first excimer laser used a xenon dimer (Xe2) energized by a beam of electrons to produce stimulated emission at an ultraviolet wavelength of 176 nm.[13] Xenon chloride and xenon fluoride have also been used in excimer (or, more accurately, exciplex) lasers.[87] The xenon chloride excimer laser has been employed, for example, in certain dermatological uses.[88]

Anesthesia

Xenon has been used as a general anaesthetic, although it is expensive. Even so, anesthesia machines that can deliver xenon are about to appear on the European market.[89] Two mechanisms for xenon anesthesia have been proposed. The first one involves the inhibition of the calcium ATPase pump—the mechanism cells use to remove calcium (Ca2+)—in the cell membrane of synapses.[90] This results from a conformational change when xenon binds to nonpolar sites inside the protein.[91] The second mechanism focuses on the non-specific interactions between the anesthetic and the lipid membrane.[92]

Xenon has a minimum alveolar concentration (MAC) of 71%, making it 50% more potent than N2O as an anesthetic.[12] Thus it can be used in concentrations with oxygen that have a lower risk of hypoxia. Unlike nitrous oxide (N2O), xenon is not a greenhouse gas and so it is also viewed as environmentally friendly. Because of the high cost of xenon, however, economic application will require a closed system so that the gas can be recycled, with the gas being appropriately filtered for contaminants between uses.[40]

Medical imaging

Gamma emission from the radioisotope 133Xe of xenon can be used to image the heart, lungs, and brain, for example, by means of single photon emission computed tomography. 133Xe has also been used to measure blood flow.[93][94][95]

Nuclei of two of the stable isotopes of xenon, 129Xe and 131Xe, have non-zero intrinsic angular momenta (nuclear spins). When mixed with alkali vapor and nitrogen and exposed to a laser beam of circularly-polarized light that is tuned to an absorption line of the alkali atoms, their nuclear spins can be aligned by a spin exchange process in which the alkali valence electrons are spin-polarized by the light and then transfer their polarization to the xenon nuclei via magnetic hyperfine coupling.[96] Typically, pure rubidium metal, heated above 100 °C, is used to produce the alkali vapor. The resulting spin polarization of xenon nuclei can surpass 50% of its maximum possible value, greatly exceeding the equilibrium value dictated by the Boltzmann distribution (typically 0.001% of the maximum value at room temperature, even in the strongest magnets). Such non-equilibrium alignment of spins is a temporary condition, and is called hyperpolarization.

Because a 129Xe nucleus has a spin of 1/2, and therefore a zero electric quadrupole moment, the 129Xe nucleus does not experience any quadrupolar interactions during collisions with other atoms, and thus its hyperpolarization can be maintained for long periods of time even after the laser beam has been turned off and the alkali vapor removed by condensation on a room-temperature surface. The time it takes for a collection of spins to return to their equilibrium (Boltzmann) polarization is called the T1 relaxation time. For 129Xe it can range from several seconds for xenon atoms dissolved in blood[97] to several hours in the gas phase[98] and several days in deeply-frozen solid xenon.[99] In contrast, 131Xe has a nuclear spin value of 3/2 and a nonzero quadrupole moment, and has T1 relaxation times in the millisecond and second ranges.[100] Hyperpolarization renders 129Xe much more detectable via magnetic resonance imaging and has been used for studies of the lungs and other tissues. It can be used, for example, to trace the flow of gases within the lungs.[101][102]

Other

In nuclear energy applications, xenon is used in bubble chambers,[103] probes, and in other areas where a high molecular weight and inert nature is desirable.

A prototype of a xenon ion engine being tested at NASA's Jet Propulsion Laboratory.

Liquid xenon is being used as a medium for detecting hypothetical weakly interacting massive particles, or WIMPs. When a WIMP collides with a xenon nucleus, it should, theoretically, strip an electron and create a primary scintillation. By using xenon, this burst of energy could then be readily distinguished from similar events caused by particles such as cosmic rays.[15] However, the XENON experiment at the Gran Sasso National Laboratory in Italy has thus far failed to find any confirmed WIMPs. Even if no WIMPs are detected, the experiment will serve to constrain the properties of dark matter and some physics models.[104] The current detector at this facility is five times as sensitive as other instruments world-wide, and the sensitivity will be increased by an order of magnitude in 2008.[105]

Xenon is the preferred fuel for ion propulsion of spacecraft because of its low ionization potential per atomic weight, and its ability to be stored as a liquid at near room temperature (under high pressure) yet be easily converted back into a gas to fuel the engine. The inert nature of xenon makes it environmentally friendly and less corrosive to an ion engine than other fuels such as mercury or caesium. Xenon was first used for satellite ion engines during the 1970s.[106] It was later employed as a propellant for Europe's SMART-1 spacecraft[16] and for the three ion propulsion engines on NASA's Dawn Spacecraft.[107]

Chemically, the perxenate compounds are used as oxidizing agents in analytical chemistry. Xenon difluoride is used as an etchant for silicon, particularly in the production of microelectromechanical systems (MEMS).[108] The anticancer drug 5-fluorouracil can be produced by reacting xenon difluoride with uracil.[109] Xenon is also used in protein crystallography. Applied at pressures from 0.5 to 5 MPa (5 to 50 atm) to a protein crystal, xenon atoms bind in predominantly hydrophobic cavities, often creating a high quality, isomorphous, heavy-atom derivative, which can be used for solving the phase problem.[110][111]

Precautions

Xenon gas can be safely kept in normal sealed glass or metal containers at standard temperature and pressure. However, it readily dissolves in most plastics and rubber, and will gradually escape from a container sealed with such materials.[112] Xenon is non-toxic, although it does dissolve in blood and belongs to a select group of substances that penetrate the blood-brain barrier, causing mild to full surgical anesthesia when inhaled in high concentrations with oxygen (see anesthesia subsection above). Many xenon compounds are explosive and toxic due to their strong oxidative properties.[113]

At 169 m/s, the speed of sound in xenon gas is slower than that in air[114] (due to the slower average speed of the heavy xenon atoms compared to nitrogen and oxygen molecules), so xenon lowers the resonant frequencies of the vocal tract when inhaled. This produces a characteristic lowered voice pitch, opposite the high-pitched voice caused by inhalation of helium. Like helium, xenon does not satisfy the body's need for oxygen and is a simple asphyxiant; consequently, many universities no longer allow the voice stunt as a general chemistry demonstration. As xenon is expensive, the gas sulfur hexafluoride, which is similar to xenon in molecular weight (146 versus 131), is generally used in this stunt, although it too is an asphyxiant.[115]

It is possible to safely breathe heavy gases such as xenon or sulfur hexafluoride when they include a 20% mixture of oxygen (although xenon at this concentration would be expected to produce the unconsciousness of general anesthesia). The lungs mix the gases very effectively and rapidly, so that the heavy gases are purged along with the oxygen and do not accumulate at the bottom of the lungs.[116] There is, however, a danger associated with any heavy gas in large quantities: it may sit invisibly in a container, and if a person enters a container filled with an odorless, colorless gas, they may find themselves breathing it unknowingly. Xenon is rarely used in large enough quantities for this to be a concern, though the potential for danger exists any time a tank or container of xenon is kept in an unventilated space.[117]

SEE LINK http://en.wikipedia.org/wiki/Xenon

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SOPHIA WISDOM III SOPHIA OF WISDOM III - CAROLINE E. KENNEDY
 
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____________________________________________________
 
AGE
OF
GEMINI
SOPHIA OF WISDOM III
CAROLINE E. KENNEDY - CAROLINA KENNEDIA
 
 
 
The Age of Gemini
Symbol for Gemini:
The zodiacal signs:
  • the vernal equinox (northern hemisphere) is occurring in Gemini;

Timeframes

  • Zodiacal 30 degrees:
  • Heindel-Rosicrucian based interpretation: began in ca. 5970 BC and ended in ca. 3814 BC (the orb of influence started in ca. 6690 BC)
  • Neil Mann interpretation: began in ca. 6450 BC and ended in ca. 4300 BC.
  • Constellation boundary year: (not calculated).
  • Shephard Simpson interpretation: (none).

Overview "The Age of Communication, Trade and the Twins"
Historical similarities During this age writing developed, and trade started to accelerate. This corresponds to the symbols the Gemini constellation represents. The constellation can be seen as two people holding hands (thought to be twins), believed by some to be symbolic for trade and communication of peoples. Regardless of the lore associated with the constellation of Gemini, both writing (including
literature, newspapers, journals, magazines and works of fiction) and trade (including merchants) are traditional archetypes belonging to the sign of Gemini.

The wheel, although having been used earlier as potter's wheels, was used for the first time for transportation purposes around the 5th millennium BC. Most forms of local transportation (horse and cart, bicycles, suburban trains, trams, cars, motorcycles, walking, roads, freeways etc) are archetypes associated with the sign of Gemini.
Religious similarities Multiple gods, such as the pantheon of gods in Ancient Greek literature, are believed to have appeared in this
Gemini age probably in Sumer (Mesopotamia). (Gemini not only is associated with the archetype of `twins' and `duality' but also 'multiplicity')

SOPHIA OF WISDOM III - CAROLINE E. KENNEDY

SOPHIA OF WISDOM III - CAROLINE E. KENNEDY

 
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AGE
OF
GEMINI
SOPHIA OF WISDOM III
CAROLINE E. KENNEDY - CAROLINA KENNEDIA
 

THE SOPHIA OF ALL THE SOPHIA'S OF WISDOMS

SOPHIA OF WISDOM III - GUEST BOOK
 
 
GUEST BOOK

JUDGEMENTS & NOTES -
 ISIS OF 10,000 NAMES

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