Uranium atomic symbol

Introduction :

Uranium atomic symbol is U.  Atomic number of Uranium is 92. Atomic Weight is 238.0289. Uranium is found in Actinide series and belongs to Radioactive Rare Earth Element. Uranium is discovered by Martin Klaproth.
It has Density of 19.05 g/cc, Melting Point 1405.5 K, Boiling Point 4018 K.
Uranium appears as Silvery-white, dense, ductile and malleable and it is a radioactive metal. 
Atomic radius of Uranium is 138 pm. 
Atomic Volume is 12.5 cc/mol. 
Electronic Configuration of uranium is [Rn] 5f³ 6d¹ 7s². 
Oxidation States of Uanium is 6, 5, 4, and 3.

Radiochemistry of Uranium:

Uranium Isotopes:
Natural uranium is 99.274 atom % ²³⁸U, 0.7205 atom % ²³⁵U, and 0.0056 atom % ²³⁴U. The 234/238 ratio is exactly the ratio of their half-lives as expected for nuclei in secular equilibrium. The isotope ²³³U is produced by neutron capture on ²³²Th, followed by β^- decay. ²³²U is a short-lived (t_1/2 =72 y) nuclide that is a contaminant in ²³³U samples (from fast neutron reactions). The daughters of ²³²U are hard gama-ray emitters that make working with 232U containing samples difficult. ^236,237,239U are produced by neutron captures on ²³⁵U and ²³⁸U. ²³⁶U is long-lived but ^237,239U are short-lived and decay to ²³⁷Np and ²³⁹Pu, respectively.

Metallic Uranium:
Metallic uranium can exist in three different solid phases with differing densities, depending on temperature.  At room temperature, a phase is observed with a density of 19.07 g/cm³ and a melting point of 1132^◦C.  Metallic uranium is a very reactive metal that is silvery in color. (Frequently, a surface oxide layer makes metallic uranium look black.) Uranium powder is pyrophoric. When uranium metal is cut or scratched in the laboratory, a shower of sparks is sometimes observed due to the creation of small particles that ignite. Uranium metal with an oxide coating will burn at 700^◦C to form U₃O₈. Uranium reacts with hot water to produce UO₂ and UH₃. In reactors, uranium is alloyed with zirconium to resist corrosion and radiation damage. Metallic uranium can be produced by the reduction of UF₄.

Uranium Compounds:

Uranium exists in the +3, +4, +5, and +6 oxidation states.  The +5 state disproportionate to the +4 and +6 states and is of little importance. Trivalent uranium reduces water and therefore there is no stable aqueous chemistry of U³⁺ although compounds do exist. The most important uranium compounds are the oxides. UO₂ is the compound used in reactor fuel. It is a stable refractory material that is brown-black in color and is nonreactive with H₂O.  Uranium hydride, UH₃, is a reactive black powder.  It is a powerful reducing agent and is pyrophoric.  A mixture of uranium and zirconium hydrides is used as the fuel.