CHEMISTRY

Reviewed by GL: And your sources of information?

Name: Uranium
 * Symbol:** U
 * Atomic Number:** 92
 * Atomic Mass:** 238.0289 amu
 * Melting Point:** 1132.0 °C (1405.15 K, 2069.6 °F)
 * Boiling Point:** 3818.0 °C (4091.15 K, 6904.4 °F)
 * Number of Protons/Electrons:** 92
 * Number of Neutrons:** 146
 * Classification:** [|Rare Earth]
 * Crystal Structure:** Orthorhombic
 * Density @ 293 K:** 18.95 g/cm3
 * Color:** silverish

The Uranium is a chemical metallic element of color silvering - grisáseo of the series of the actínidos, his (her,your) chemical symbol is Or and his(her,your) atomic number is 92. For it it(he,she) possesses 92 protons and 92 electrons, with a valency of 6. His (her,your) core(nucleus) can contain between(among) 141 and 146 neutrons, his(her,your) more abundant isotopes are the U-238 than possesses 146 neutrons and the U-235 with 143 neutrons. The Uranium has the major atomic weight of between (among) all the elements that they find in the nature. The Uranium is approximately 70 denser than % the lead, though less dense than the gold or the wolframio. It(he) is slightly radioactive. It was discovered in 1789 by M. H. Klaproth that it called this way in the honor of the planet Uranus that had just been an overdraft in 1781. The natural uranium is formed (trained) by three types of isotopes: uranium 238 (238U, uranium 235 (235U and uranium 234 (234U). Of every gram of natural uranium 99,284 % of the mass is an uranium 238, 0,711 % uranium 235, [1 and 0, 0085 % uranium 234. The relation Uranio-238/Uranio-235 is constant in the terrestrial bark, except certain exceptions.