The specific property of Uranium-235 (U-235) that makes it suitable for use in nuclear weapons is its high probability of undergoing nuclear fission when struck by a neutron, particularly a slow or 'thermal' neutron, and the fact that each fission event releases multiple neutrons. This ability to readily fission and release neutrons is crucial for sustaining a rapidly escalating nuclear chain reaction. When a neutron strikes a U-235 n....
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