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Nuclear fission is the process in which a heavy atomic nucleus splits into smaller and more stable nuclei. Typically, the nuclei of heavy elements such as uranium-235 or plutonium-239 become unstable when struck by a neutron and divide into two or more fragments. During this division, free neutrons are also released, which can interact with surrounding nuclei to initiate chain reactions. The energy released in this process arises from the difference in nuclear binding energy and appears primaril

Lise Meitner was a physicist who conducted research in radioactivity and nuclear physics during the first half of the 20th century. She began her scientific career in Austria and, together with Otto Hahn in Germany, discovered the element protactinium and, with Otto Robert Frisch, provided the theoretical explanation of the nuclear fission process. Meitner’s work served as a foundation for scientific publications on nuclear transformations and nuclear reactions. Early Life and Education Lise Mei