The nucleus of uranium-238 consists of 92 protons and 146 neutrons. When the uranium nucleus is divided into two equal parts, 2 nuclei of the praseodymium-119 isotope should be obtained. There are 62 neutrons in the nucleus of the stable isotope praseodymium, not 73. Nuclei with such a large excess of neutrons do not occur in nature. Therefore, it is expected that the fission of uranium nuclei is accompanied by the release of several neutrons.
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