- a white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass. The 235 isotope is used in atomic and hydrogen bombs and as a fuel in nuclear reactors. Symbol: U; atomic weight: 238.03; atomic number: 92; specific gravity: 19.07.
Origin of uranium
Examples from the Web for uranium
And that conglomerate also owns nearly 70 percent of the Rossing uranium mine in Namibia.
Since then, all dividend payments have been frozen and Iran receives “no uranium or revenue from the mine.”
A drawing of what was deemed a “deer pig” was also sent through the uranium decay ringer.The Oldest Cave Art May Not Be in Europe
October 9, 2014
A six-month quasi-limit on uranium enrichment does not mean the government has changed.How America’s Nuclear Deal Sold Out Iran’s Liberals
David Keyes & Ahmad Batebi
December 3, 2013
It completely stops enrichment of uranium to 20 percent—the level needed to make a bomb.Obama and the Munich Katrinas
November 26, 2013
To begin with metals, uranium melts at 1150 centigrade, and tungsten at 3370 and iridium at 2350.Pariah Planet
It's not controllable enough and uranium isn't something we could carry by the ton.Islands of Space
John W Campbell
Transpose it into platinum or uranium—anything good and heavy.The Galaxy Primes
Edward Elmer Smith
Nova-Maurania was nearly 40 percent uranium, and who could resist that?Dead World
In some varieties the oxide of uranium is also present in traces.
- a radioactive silvery-white metallic element of the actinide series. It occurs in several minerals including pitchblende, carnotite, and autunite and is used chiefly as a source of nuclear energy by fission of the radioisotope uranium-235 . Symbol: U; atomic no: 92; atomic wt: 238.0289; half-life of most stable isotope, 238 U: 451 × 10 9 years; valency: 2-6; relative density: 18.95 (approx.); melting pt: 1135°C; boiling pt: 4134°C
Word Origin and History for uranium
rare metallic element, 1797, named 1789 in Modern Latin by its discoverer, German chemist and mineralogist Martin Heinrich Klaproth (1743-1817), for the recently found planet Uranus (q.v.).
- An easily oxidized radioactive toxic metallic element having 16 known isotopes, of which U 238 is the most naturally abundant. Atomic number 92.
- A heavy, silvery-white, highly toxic, radioactive metallic element of the actinide series. It has 14 known isotopes, of which U 238 is the most naturally abundant, occurring in several minerals. Fissionable isotopes, especially U 235, are used in nuclear reactors and nuclear weapons. Atomic number 92; atomic weight 238.03; melting point 1,132°C; boiling point 3,818°C; specific gravity 18.95; valence 2, 3, 4, 5, 6. See Periodic Table.