Kazakhstan (in 2010).
More than 99%of naturally occurring uranium is U-238. The valuable U-235 makes up less than 1% of uranium, and must be "enriched" in complicated processes.
Natural francium exist in uranium and thorium ores.
Now only Namibia, Niger and South Africa are important producers of uranium.
There are 3 major isotopes of uranium: Uranium-238, 235, and 234. These numbers are the amount of neutrons in the nucleus. Since Uranium only has 92 protons, this makes these isotopes VERY neutron-heavy!Uranium-238 is the most common in nature, followed by 235, then 234. All these are radioactive isotopes. Because there are so many neutrons in Uranium, it makes it fissile -- easy to split.
The most common isotope of uranium is uranium-238.
cavca
238 represents the most common isotope of uranium, uranium-238. It is a naturally occurring isotope found in uranium ores and makes up over 99% of natural uranium. It is not fissile, but can be converted into fissile plutonium-239 in nuclear reactors.
Uranium is the most common element used in nuclear power plants to generate energy through a process called nuclear fission.
Uranium
Uranium
I think uranium has the higgest number of electrons of all the naturally found elements. Uranium in its stable state have 92 protons and 92 electons but the thing that makes it radioactive is the number of neutrons (146). Purification of uranium from uranium oxide is really expensive.