Approx. 9 billion years.
Uranium becomes lead
Being radioactive, uranium is not a stable element.
Uranium minerals support a long way of transformations to become sintered pellets of uranium dioxide, the most common nuclear fuel.
No, uranium will not become iron. Uranium is a radioactive element that will not naturally transform into iron. Iron is a different element and the two elements do not undergo a natural transformation process from one to the other.
A billion years from now
Uranium could theoreticaly last forever. The life of each uranium particle is random but over a large mass a half life can be calculated. Uranium-238(most common type of uranium) has a half life of 704 billion years so if you had 12500 tons of uranium after 704 billion years there would be 6250 tons. Every 704 billion years the mass would half until there was only an insignificant amount left.
Become radioactive and die..
A freshly cut surface on uranium is silvery white and quite reflective, but in air uranium oxidizes very rapidly and in minutes this surface will become tarnished with a black uranium oxide coating.
A uranium-235 nucleus must absorb a neutron in order to become unstable and split, a process known as nuclear fission. This absorption of a neutron causes the uranium-235 nucleus to become uranium-236, which then splits into two smaller nuclei, releasing additional neutrons and a large amount of energy.
Uranium-234 become protactinium by emission of a beta particle. A proton is transformed in a neutron.
If you do not center the specimen before moving to higher magnifications on a microscope, the specimen may move out of the field of view or become difficult to find at the higher magnification. This can lead to difficulties in focusing and observing the specimen accurately. It's important to center the specimen at lower magnifications before moving to higher ones to maintain a clear view.
In the reaction238U + n-------239U-------239Np + e--------239Pu + eone atom of uranium become one atom of plutonium.