U meaning in Chemistry ?

Answer:

What is Uranium mean?

Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all isotopes of uranium are unstable; the half-lives of its naturally occurring isotopes range between 159,200 years and 4.5 billion years. The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and uranium-235 (which has 143 neutrons). Uranium has the highest atomic weight of the primordially occurring elements. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite.

In nature, uranium is found as uranium-238 (99.2739–99.2752%), uranium-235 (0.7198–0.7202%), and a very small amount of uranium-234 (0.0050–0.0059%). Uranium decays slowly by emitting an alpha particle. The half-life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years, making them useful in dating the age of the Earth.

Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 is the only naturally occurring fissile isotope, which makes it widely used in nuclear power plants and nuclear weapons. However, because of the tiny amounts found in nature, uranium needs to undergo enrichment so that enough uranium-235 is present. Uranium-238 is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor. Another fissile isotope, uranium-233, can be produced from natural thorium and is studied for future industrial use in nuclear technology. Uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons; uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction. This generates the heat in nuclear power reactors, and produces the fissile material for nuclear weapons. Depleted uranium (238U) is used in kinetic energy penetrators and armor plating. Uranium is used as a colorant in uranium glass, producing lemon yellow to green colors. Uranium glass fluoresces green in ultraviolet light. It was also used for tinting and shading in early photography.

The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the recently discovered planet Uranus. Eugène-Melchior Péligot was the first person to isolate the metal and its radioactive properties were discovered in 1896 by Henri Becquerel. Research by Otto Hahn, Lise Meitner, Enrico Fermi and others, such as J. Robert Oppenheimer starting in 1934 led to its use as a fuel in the nuclear power industry and in Little Boy, the first nuclear weapon used in war. An ensuing arms race during the Cold War between the United States and the Soviet Union produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived plutonium-239. The security of those weapons is closely monitored. Since around 2000, plutonium obtained by dismantling cold war era bombs is used as fuel for nuclear reactors.

The development and deployment of these nuclear reactors continue on a global base. There is increasing interest in these power plants as they are powerful sources of CO2-free energy. In 2019, 440 nuclear power reactors produced 2586 TWh (billion kWh) of CO2-free electricity worldwide, more than the global installations of solar and wind power combined.

reference

Full Form	Category
Uncertain	Academic & Science
Uracil	Academic & Science
Unified atomic mass unit	Academic & Science
Unexcelled	Academic & Science
Unsatisfactory	Academic & Science
Undergraduate	Academic & Science
University	Academic & Science
Undecided	Academic & Science
Undergirding	Academic & Science
Uranium Participation Corporation	Business
U S Airways Group, Inc.	Business
Unlimited	Business
Undetectable	Chemistry
Uranium	Chemistry
Universal Pictures	Community
Use	Community
Uhf	Community
Union	Community
Unity	Community
Unification	Community
Urban	Community
Understanding	Community
Universal	Community
Unconditional	Computer Assembly Language
Up	Computer Assembly Language
Unwind Tape	Computer Hardware
Userid	Computing
Unlocked	Computing
Undefined	Computing
Unicode	Computing
Users	Computing
Integrated Circuit (circuit Diagram Marking)	Electronics
Subsampled Raw Yuv File Bitmap Graphics	File Type
Unhappy	General
Upbuilding	General
Ursula	General
The Uncompensated	General
The Usual	General
Unplasticised	General
Underwear	General
Uncommon	General
Unlicensed	Governmental
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Unavailable	Governmental
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Uncommitted	Governmental
Uninduced	Governmental
Unredacted	Governmental
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Umleitung	International
U-Bahn	International
Und	International
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United	Sports
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Uniform	Transport & Travel