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In this paper, Meitner and Frisch called the division of the nucleus "fission." Uranium  had been split into barium and possibly krypton, but since barium was so far down the  table, at No. 56, Fermi had failed to identify it as such. Immediately speculation began  over the uses of atomic energy, both productive and destructive. Scientists everywhere  attempted to duplicate the experiment and found themselves astonished at their  success. Bohr himself contributed to the excitement with his perception that the rare  isotope of uranium with atomic weight 235, because of its uneven number of neutrons,  was more likely to be capable of fission. The problem still remained that more energy was required to cause the split than could  be produced by it. But further experiments by Bohr, Fermi, and others revealed the  possibility that a chain reaction could be set off by the neutrons released in fission. The 
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