Answer :
Final answer:
The number '235' in Uranium-235 represents its atomic mass, which is the sum of its protons and neutrons. This isotope is significant in nuclear reactors and the creation of nuclear weapons.
Explanation:
In the case of the radioactive isotope Uranium-235, the number '235' is an indicator of the atomic mass of the isotope. The atomic mass of an isotope is determined by the sum of protons and neutrons, which are found in the nucleus of the atom. So, for Uranium-235, there are 143 neutrons and 92 protons (Uranium's atomic number), summing up to an atomic mass of 235.
This isotope is critical in nuclear reactors, specifically in the process of uranium enrichment. When Uranium-235 is bombarded with a neutron, fission occurs, and a large amount of energy is released. However, this same process is a concern in the creation of nuclear weapons.
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