Which of the following Isotope of Uranium does not exist?

Explanation:

The symbol and the atomic number of the element Uranium are U and  92 respectively.

• In the actinide series of the periodic table, it's a silvery-grey metal.
• Each atom of uranium has 92 protons and 92 electrons, of which 6 are valence electrons.
• All isotopes of uranium are unstable therefore it is radioactive.
  • Its naturally occurring isotopes have half-lives ranging between 159,200 years and 4.5 billion years.
  • Uranium-238 (with 146 neutrons and over 99% of uranium on Earth) and uranium-235 (with 143 neutrons) are the most common isotopes in natural uranium.
  • Among the primordially occurring elements, Uranium has the highest atomic weight.

Isotopes of Uranium-235:

• Uranium-233 (U233) is a fissile isotope of uranium that is bred from thorium-232 as part of the thorium fuel cycle.
• Uranium-235 (U²³⁵) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction.
• Uranium-238 (U238) is the most common isotope of uranium found in nature, with a relative abundance of 99%. It is non-fissile, which means it cannot sustain a chain reaction.