noun
definition
The element with atomic number 92 and symbol U: a radioactive silvery-grey metal in the actinide series.
Examples of uranium in a Sentence
Uranium is chemically related to chromium, molybdenum and tungsten.
The only practically available raw material for 'the extraction of uranium is pitchblende (q.v.).
The mother liquor includes generally more or less of nickel, cobalt, zinc and other heavy metals, which, as Wailer showed, can be removed as insoluble sulphides by the addition of ammonium sulphide; uranium, under the circumstances, is not precipitated by this reagent.
The sulphates are treated with water, which dissolves the uranium and other soluble salts, while silica, lead sulphate, &c., remain; these are removed by filtration.
In the same year as Klaproth detected uranium, he also isolated zirconia or zirconium oxide from the mineral variously known as zircon, hyacinth, jacynth and jargoon; but he failed to obtain the metal, this being first accomplished some years later by Berzelius, who decomposed the double potassium zirconium fluoride with potassium.
He concluded that the uranium salt was Ur 2033S0 3, where Ur 2 0 3, according to his analysis, represents 864 parts of yellow oxide (0 = 16).
Uranium is a white malleable metal, which is pretty hard, though softer than steel.
Exposed to air this mixture is oxidized to the pigment uranium red, U6(NH4)2S09, which is a fine blood-coloured amorphous powder.
Uranyl nitrate, U02(N03)2.6H20, is the most important uranium salt.
Uranyl chloride, UO 2 C1 2, is a yellow crystalline mass formed when chlorine is passed over uranium dioxide at a red heat.
Curie obtained only a fraction of a gramme of the chloride and Giesel 2 to 3 gramme of the bromide from a ton of uranium residues.
In 1789 Klaproth isolated from pitchblende a yellow oxide which he viewed as the oxide of a new metal, which he named uranium, after the newly discovered planet of Herschel.
The filtrate contains the uranium as uranous and the iron as ferrous salt.
The precipitate, after having been collected and washed, is digested with a warm concentrated solution of ammonium carbonate, which dissolves the uranium as a yellow solution of ammonium uranate, while the hydrated oxide of iron, the alumina, &c., remain.
After removing the uranium, it was found that the bismuth separated with a very active substance - polonium; this element was afterwards isolated by Marckwald, and proved to be identical with his radiotellurium; that the barium could be separated with another active substance - radium; whilst a third fraction, composed mainly of the rare earths (thorium, &c.), yielded to Debierne another radioactive element - actinium, which proved to be identical with the emanium of Giesel.
The most modern and the most generally accepted method is volumetric, and is based on the reaction between zinc chloride and potassium ferrocyanide, by which insoluble zinc ferrocyanide and soluble potassium chloride are formed; the presence of the slightest excess of potassium ferrocyanide is shown by a brownish tint being imparted by the solution to a drop of uranium nitrate.
Ordinary industrial containers are used for low-activity material such as uranium ore concentrate.
Edmond Becquerel was associated with his father in much of his work, but he himself paid special attention to the study of light, investigating the photochemical effects and spectroscopic characters of solar radiation and the electric light, and the phenomena of phosphorescence, particularly as displayed by the sulphides and by compounds of uranium.
By reducing the oxide with charcoal at a high temperature, he obtained a product which he took to be metallic uranium.
These results were adopted until Peligot in 1840 discovered that Berzelius's (and Klaproth's) metal contains oxygen, and that his (Ur 2) 0 3 really is (U606) 03= 3U 2 0 3, where U= 120 is one equivalent weight of real uranium.
It is a member of the sixth group in the periodic classification of the elements, being included in the natural family of elements containing molybdenum, tungsten and uranium.
Teheran has been given steady attention since it renewed its uranium enrichment program - and thereby abrogated a commitment not to do so.
Iraq has made several attempts to buy high-strength aluminum tubes used to enrich uranium for a nuclear weapon.
It was here that depleted uranium ammunition was used for the first time - more than 30 metric tons - 300,000 rounds in all.
Team hasn't reached antoine cesar becquerel layer of uranium.
An ability to powered by a decried Bennett compared piece of uranium.
Bennett compared piece of uranium.
Such uranium centrifuges appear to be key to North Korea's revived nuclear bomb program.
That program was based on gas centrifuge uranium enrichment.
In paris for for example Charles able to make uncommon uranium mineral.
Advanced gas cooled reactor A development of the Magnox reactor, using enriched uranium oxide fuel in stainless steel cladding.
My own government would say it should not engage in uranium conversion at the plant at Isfahan.
Money to gamble metal dissipated quickly uranium metal posed a deep slit.
Also makes a from uranium did doubt the electromagnetic.
When uranium decays, it becomes radium, and when radium decays, it becomes radon.
Exposure to uranium is a very rare cause of lung cancer.
Nowhere to take the college game uranium metal posed Gabriel stokes.
Uranium extraction has resulted in more than 6 billion tons of radioactive tailings, with significant impact on human health [2] .
Uranium has a particular effect on the proximal tubules of the kidney.
Does the danger of depleted uranium also exist apart from the area of the south?
You will not enrich uranium, he has told Iran.
The chances of al-Qaeda procuring uranium from India are quite high.
The IAEA in March 2003 had not received any evidence about Iraqi attempts to import uranium.
The U-235 isotope makes up 0.7 per cent of naturally occurring uranium.
The suspect uranium enrichment plant, for example, could be used to produce highly-enriched uranium for weapons.
Iran claims its centrifuge program is designed to produce low-enriched uranium, to support Iran's civil nuclear power program.
What North Korea has plenty of is natural uranium, which could supply nuclear power for hundreds of years.
The network sold uranium hexafluoride, the gas that the centrifuge process can transform into enriched uranium hexafluoride, the gas that the centrifuge process can transform into enriched uranium for nuclear bombs.
We will help nations end the use of weapons-grade uranium in research reactors.
While you are reading this, the Iranian reactor produces enriched bomb-grade uranium.