Definition: Uranyls, also known as "uranium" or "uranium-235," are a type of radioactive isotope found in the Earth's crust. They have an atomic number of 94 and their relative abundance varies between several billion to hundreds of billions. These isotopes are used in nuclear reactors and other applications due to their high stability and potential for use in nuclear weapons. The term "urananyls" refers to the specific isotope known as "uranium-