Uranium metal, high-density, and density close to almost gold density, but a single atom of uranium mass is much greater than the mass of the gold atom, and thus the uranium metal is a metal that Dhirth considered more metal atoms by weight and the most mass, and it is not the highest density , as the higher mineral density is osmium (where the higher density is the highest compaction of the block within the unit volume and osmium are higher than in uranium). Uranium metal is the most widely used metal in nuclear tests in the laboratory, it is natural corn the most candidates, nuclear fission and composition of other elements and liberalization of the energy, the atomic number (number of protons) of an atom of uranium has 92, and enriched his six matches in nature are all equal course in atomic number and is 92, but it is different in mass number, Venzair uranium known are: uranium 232 uranium 233. uranium 234 U-235 uranium 236. uranium 238, where the number after the name refers to the weight mass and weight mass expresses the sum of protons and neutrons in the nucleus, If the number of protons constant (the number of protons that determines the atom's identity), the difference is in the number of neutrons are in the previous isotopes, respectively, as follows (subtract 92 from the mass number to get them): 140 141 142, 143 144 146 . And uranium found in nature as the isotope: uranium-238 as the highest proportion of this isotope accounts for 97% of the amount of uranium found in nature. It considers uranium metal element The radioactivity in the sense that it is unstable and its atoms disintegrate Tregia to be atoms of other elements and launches energy as a result, and this is what scientists to study urged to take advantage of that characteristic to him and is the amenability of nuclear fission and energy that could benefit mankind dramatically launch