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Uranium

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Identification
Molecular formula
U
CAS number
7440-61-1
IUPAC name
uranium
State
State

At room temperature, uranium is a solid metal. It belongs to the actinide series in the periodic table and is weakly radioactive. It tends to exist in various oxidation states, which makes it chemically active. Its stability at room temperature allows it to be used in different applications, especially in the nuclear industry.

Melting point (Celsius)
1 132.00
Melting point (Kelvin)
1 405.00
Boiling point (Celsius)
4 131.00
Boiling point (Kelvin)
4 404.00
General information
Molecular weight
238.03g/mol
Molar mass
238.0290g/mol
Density
19.0500g/cm3
Appearence

Uranium is a silvery-white metallic element with a shiny luster. It is dense and heavy, and when finely divided, it turns black and forms oxides rapidly in air. The metal itself is very reactive and tends to oxidize to form a coating that can appear faintly colored when exposed to air.

Comment on solubility

Solubility of Uranium Compounds

The solubility of uranium, mainly in the form of its compounds, varies widely depending on the specific chemical species and environmental conditions. Here are some important points to consider:

  • Uranium Oxides: Compounds like UO2 (uranium dioxide) and U3O8 (triuranium octoxide) are generally insoluble in water, limiting their availability in aqueous environments.
  • Uranyl Compounds: On the other hand, uranyl ions (UO22+) form complexes with anions and can be highly soluble in both acidic and alkaline solutions. For example, uranyl acetate and uranyl nitrate are known to have considerable solubility in water.
  • Temperature and pH Influence: Solubility is greatly affected by factors such as temperature, pH, and the presence of other ions, making it essential to consider these conditions when studying uranium behavior in various environments.
  • Environmental Impact: Due to its varying solubility, the mobility of uranium in contaminated sites can lead to significant ecological and health concerns, especially when in soluble forms.

In conclusion, the solubility of uranium compounds is not uniform and is influenced by several factors. Understanding these solubility characteristics is crucial for both environmental science and nuclear chemistry.

Interesting facts

Interesting Facts About Uranium

Uranium is a fascinating element that plays a crucial role in both energy production and medical applications. Here are some captivating insights:

  • Elemental Background: Uranium, symbolized as U, is a silvery-white metal found in the actinide series of the periodic table, making it one of the heaviest naturally occurring elements.
  • Radioactivity: Uranium is known for its radioactive properties, primarily due to its isotopes, 238U and 235U. In particular, 235U is utilized in nuclear reactors and weapons because it can sustain a chain reaction.
  • Nuclear Energy: Uranium powers a significant percentage of electricity generation worldwide. In fact, approximately 10% of the world’s electricity comes from nuclear power plants that use uranium as fuel.
  • Rich History: The discovery of uranium dates back to 1789 by Martin Heinrich Klaproth, who named it after the planet Uranus. This element has since gained a storied reputation in both science and politics.
  • Mining and Processing: The extraction of uranium from the earth occurs through mining, often through open-pit or underground methods. Once mined, the ore undergoes processing to extract the uranium, which can then be enriched for use in various applications.
  • Medical Applications: Beyond energy, uranium isotopes have applications in medicine, particularly in radiotherapy for cancer treatment. However, the use of uranium in medical fields is closely regulated due to its radioactive nature.

As Albert Einstein famously said, “Nuclear proliferation is a matter of great concern. The knowledge of nuclear energy should be applied responsibly.” This quote highlights the importance of managing uranium with caution, balancing its vast energy potential with safety and ethical considerations.

Uranium remains a key subject of study in both chemistry and physics, continuously captivating scientists and researchers with its properties and applications.

Synonyms
URANIUM
Uranium, natural
7440-61-1
Uranium, elemental
URANIUM ATOM
238U Element
Uranium cation (6+)
Uranium I ((238)U)
Uranium, isotope of mass 238
HSDB 2553
UNII-4OC371KSTK
EINECS 231-170-6
uranium(0)
CCRIS 9497
URANIUM [HSDB]
URANIUM [MI]
URANIUM [WHO-DD]
URANIUM U-238
5PI36AS4G7
DTXSID1042522
U 238
U-238
UNII-5PI36AS4G7
Uranium and compounds
Uranium, ion(U6)
URANIUM METAL
URANIUM (VI)
URANIUM ION(6+)
UN2979 (Uranium metal)
URANIUM (6+) CATION
DTXCID304373
DTXSID2024373
Uranium metal: Uranium compounds
URANIUM-238 (238-U)
U6
231-170-6
nocas_24373
U
Uranium-238
uranium(6+) ion
uranium(5+)
uranium(6+)
238U
4OC371KSTK
uranio
U1
Uranium, ion(U6 )
UN2979
Uranium Standard: U @ 1000 microg/mL in 5% HNO3
Uranium Standard: U @ 10000 microg/mL in 5% HNO3
Uran
Depleted Uranium
uranium(V) cation
IUM
uranium(5+) ion
uranium(VI) cation
Uranium metal, pyrophoric
URANIUM 238
CHEBI:27214
CHEBI:32991
CHEBI:32992
CHEBI:49936
U(0)
NS00099729
Q1098
U(5+)
U(6+)
Uranium - U @ 1000 microg/mL in 5% HNO3
Uranium Standard: U @ 10 microg/mL in 2% HNO3
Uranium metal, pyrophoric [UN2979] [Radioactive]
Q27115170
Q27115171
U6+