Planets Uranus

Planet Uranus) Yellow-colored glass, containing more than 1% uranium oxide and dating back to 79 A.D., has been found near Naples, Italy. Klaproth recognized an unknown element in pitchblende and attempted to isolate the metal in 1789. 

Uranium [7440-61-17 is a naturally occurring radioactive element with atomic number 92 and atomic mass 238.03. Uranium was discovered in a pitchblende [1317-75-5] specimen ia 1789 by M. H. Klaproth (1) who named the element uranit after the planet Uranus, which had been recendy discovered. For 50 years the material discovered by Klaproth was thought to be metallic uranium. Pnligot showed that the uranit discovered by Klaproth was really uranium dioxide [1344-57-6] UO2, and obtained the tme elemental uranium as a black powder in 1841 by reduction of UCl [10026-10-5] with potassium (2). 

In 1789 M. H. Klaproth examined pitchblende, thought at the time to be a mixed oxide ore of zinc, iron and tungsten, and showed that it contained a new element which he named uranium after the recendy discovered planet, Uranus. Then in 1828 J. J. Berzelius obtained an oxide, from a Norwegian ore now known as thorite he named this thoria after the Scandinavian god of war and, by reduction of its tetrachloride with potassium, isolated the metal thorium. The same method was subsequendy used in 1841 by B. Peligot to effect the first preparation of metallic uranium. 

Effects of condensation are also seen in the bulk compositions of the planets and their satellites. The outer planets, Uranus and Neptune, have overall densities consistent with their formation from icy and stony solids. The satellites of Uranus have typical densities of 1.3g/cm which would tend to indicate a large ice com-... 

Name named after the planet Uranus, which was discovered as a new planet shortly before (1781) when 0. Hahn split the uranium atom in 1939, we entered the atomic age... 

Uranium (U, [Rn]5/36t/1752), name and symbol after the planet Uranus. Discovered (1789) by Martin J. Klaproth, the metal was isolated (1841) by Eugene M. Peligot. Silvery metal. 

Neptunium - the atomic niunber is 93 and the chemical symbol is Np. The name derives from the planet Neptune (the Roman god of the sea), since it is the next outer-most planet beyond the planet uranus in the solar system and this element is the next one beyond uranium in the periodic table.lt was first synthesized by Edwin M. McMillan and Philip H. Abelson in 1940 via the nuclear reaction n, y) U P = p. The longest half-life associated with this mistable... 

Uranium - the atomic number is 92 and the chemical symbol is U. The name derives from the planet Uranus, which in Roman mythology was Father Heaven . The German chemist Martin-Heinrich Klaproth discovered the element in 1789, following the German/English astronomer William Hershel s discovery of the planet in 1781. The metal was first isolated by the French chemist Eugene-Melchior Peligot in 1841. 

Of some interest is that after uranium ( jU) was named after the planet Uranus, neptunium (jjNp), which was discovered next, was named after Neptune, the next planet in our solar system. And Anally, plutonium (g4Pu) the next transuranic element discovered, was named after Pluto, the last planet discovered so far in our solar system. 

French chemist Eugene-Melchior Peligot Dense radioactive metal named for the planet Uranus first used in nuclear fission in the 1930s it isotopes fundamental to the operation of nuclear breeder reactors. 

The element was discovered in the pitchblende ores by the German chemist M.S. Klaproth in 1789. He named this new element uranium after the planet Uranus which had just been discovered eight years earlier in 1781. The metal was isolated first in 1841 by Pehgot by reducing the anhydrous chloride with potassium. Its radioactivity was discovered by Henry Becquerel in 1896. Then in the 1930 s and 40 s there were several revolutionary discoveries of nuclear properties of uranium. In 1934, Enrico Fermi and co-workers observed the beta radioactivity of uranium, following neutron bombardment and in 1939, Lise Meitner, Otto Hahn, and Fritz Strassmann discovered fission of uranium nucleus when bombarded with thermal neutrons to produce radioactive iso-... 

When Klaproth dissolved some pitchblende in nitric acid and neutralized the acid with potash, he obtained a yellow precipitate which dissolved in excess potash. Klaproth concluded correctly that the mineral must contain a new element, which he named in honor of the new planet, Uranus, which Herschelhad recently discovered (12). He then attempted to obtain metallic uranium just as Hjelm had prepared metallic molybdenum. By strongly heating an oil paste of the yellow oxide in a charcoal crucible, he obtained a black powder with a metallic luster, and thought he had succeeded in isolating metallic uranium (29). For over fifty years the elementary nature of his product was accepted by chemists, but in 1841 Peligot showed that this supposed uranium metal was really an oxide. 

In the course of investigating the production of platinum from its ores, Wollaston and Tennant found four new elements in 1803. Tennant isolated osmium and iridium Wollaston found rhodium and palladium. As was the contemporary habit, Wollaston named the latter after a newly discovered celestial body. Uranium gained its name this way after William Herschel s discovery of the planet Uranus, and palladium honoured the asteroid Pallas, found in 1802. 

Neptunium, the element beyond uranium, was named after the planet Neptune because this planet is beyond the planet Uranus for which uranium is named. 

A child on the planet Uranus would ask the question, Why is the sky green A child on Jupiter would ask the question, Why is the sky reddish brown How would you answer these questions Relate your answer to the chemical composition of the atmospheres of these planets. 

Uranium U 92 Martin Klaproth Germany From the planet Uranus... 

Uranium was the first actinide element to be identified. In 1789, M. H. Klaproth discovered the presence of a new element in a sample of pitchblende (impure, mineralized form of UO2). Klaproth named the element uranite after the recently discovered planet Uranus. Nearly 100 years later, Becquerel made the initial discovery of the radioactive behavior of uranium through experiments with uranium minerals and photographic plates. 

The first platinum to be subjected to experimental investigation was brought to England in 1741 by Charles Wood, an assayer from Jamaica. He determined that the metal could not be fused by the force of any fire then available, formed low-melting alloys with several metals, and had a density similar to that of gold. His results were communicated in 1750 to the Royal Society of London by William Watson and later were published in the Philosophical Transactions (6). This publication sparked interest throughout Europe, for the discovery of a new noble metal was as much a surprise to chemists as the discovery of the new planet Uranus by Herschel was to be to astronomers 30 years later. 

In 1940, a pair of physicists at the University of California, Berkeley, were studying this problem. Edwin M. McMillan (1907—1991) and Philip H. Abelson (1913—2004) reported finding evidence of element number 93. They suggested naming it neptunium, in honor of the planet Neptune. (Uranium, the element before neptunium, had been named for the planet Uranus.)... 

The name uranium and the symbol come from the planet Uranus, discovered in 1781. In turn, Uranus comes from the Greek name Ouranos, the son and husband of Gaia. Although uranium oxide had been used as a glass coloring agent from at least 79 c.E., it was Martin Klaproth (1743-1817) who discovered a new element in pitchblende ores in 1789. He named the element after the recently discovered planet. Klaproth did not know that he had found the end of the natural elements, as all heavier elements do not exist in... 

Voyager 2 was launched at an especially propitious moment in the history of the solar system At the time four of the outer planets— Jupiter, Saturn, Uranus, and Neptune—were aligned in such a way as to allow the spacecraft to fly past them all, providing scientists with their first close look at the next-to-outermost planets, Uranus and Neptune, in addition to the planned targets of Jupiter and Saturn. The alignment that permitted this special tour of observation occurs only once every 175 years, so the data provided by Voyager 2 about Uranus and Neptune has been of very special value to researchers. 

This Hubble Space Telescope image ofthe planet Uranus shows its ring system and six of its moons. They are, clockwise from the top, Desdemona, Belinda, Ariel, Portia, Cressida and Puck. (SPACE TELESCOPE SCIENCE INSTITUTE/NASA//Photo Researchers, Inc.)... 

Symbol The Water Bearer Ruling Planet Uranus Opposite Sign Leo... 

Neptunium was named after Neptune and was the second element to be named after a planet. Uranium had been named in 1789 in honor of the discovery of the planet Uranus eight years earlier. 

Avery small amount of (0.005%) occurs in secnlar equilibrium with Uranium was discovered in 1789 by Martin Klaproth, who named it after the planet Uranus (which had just been discovered). In 1841 Eugene Melchior Peligot prepared uranium metal and proved that Klaproth had actually isolated uranium dioxide. 

Spectroscopic observations of Jupiter and Saturn made with the Infrared Space Observatory are consistent with other estimates of protosolar D/H (see Robert et al. 2000 and references therein), as is the D/H value determined by the Galileo atmospheric entry probe mass spectrometer (26 7 ppm Mahaffy et al. 1998). This result is expected as the jovian planets are thought to have formed by quantitative capture of gas from the solar nebula. On the other hand, the outer solar system planets Uranus and Neptune appear to be significantly enriched in D/H by factors of -3 compared to the protosolar value (Feuchtgruber et al. 1999). This enrichment is interpreted to reflect the mixing of material from the more D-rich icy cores of these planets, which constitutes a significant fraction of their mass (as opposed to the jovian case where the planetary mass is dominated by the gaseous envelope). 

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