Uranium

Uranium is a radioactive element with an atomic number of 92. It is a silvery-gray solid.

Etymology
Uranium is named after Uranus.

In nature
In nature, a large number of Uranium Ores are present. These not only contain Uranium, but other otherwise rare elements in nature, such as Actinium and at certain decaying times, Astatine.

Uses
Uranium is a good nuclear fuel for nuclear power stations and nuclear weapons.

Properties
Uranium is a slightly radioactive metal that lasts 4 billion years at most, in the form of U-238. It is one of the two radioactive elements that can be found in significant quantities in nature, the other being Thorium.