Uranium

By Keith lowy

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Uranium is a chemical element located in period 7/f-block with symbol U and atomic number 92 and atomic mass of 238(3). Its a silvery-white metal in the actinide series.
Uranium has 92 protons and 92 electrons of which 6 are valence electrons. Uranium is weakly radioactive because all of its isotopes are unstable (with half-lives of the 6 naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4 1⁄2 billion years). Uranium has 140-150 neutrons depending on the type such as Uranium-238 has 146 neutrons while Uranium-235 has only 143.

Physical properties

Phase: Solid

Melting point: 1405.3 k (1132.2 °C, ​2070 °F)

Boiling point: 4404 k (4131 °C, ​7468 °F)

Density: 19.1 g·cm−3

Density liquid: 17.3 g·cm−3

Heat of fusion: 9.14 kJ·mol−1

Heat of vaporization: 417.1 kJ·mol−1

Molar heat capacity: 27.665 J·mol−1·K−1

Vapor pressure

P(Pa) (1) {10} [100] <1k> >10k< "100k"

at T (k) (2325) {2564} [2859] <3234> >3727< "4402"

Chemical properties

Thermal expansion: 13.9 µm·m−1·K−1 (at 25 °C)

Thermal conductivity: 27.5 W·m−1·K−1

Electrical resistivity: at 0 °C: 0.280 µΩ·m

Magnetic ordering: Paramagnetic

Young's modulus: 208 Gpa

Bulk modulus: 100 Gpa

History

Naming: after planet Uranus, itself named after Greek god of the sky Uranus

Discovery: Martin Heinrich Klaproth (1789)

First isolation: Eugène-Melchior Péligot (1841)

Ways Uranium has been used

Once depleted militaries use them for high-density penetrators

Uranium based nuke nicknamed "little boy"

Citrobacter

Species can have concentrations of uranium in their bodies 300 times higher than in the surrounding environment.
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