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When a 235-U nucleus is bombarded by neutrons (1-n) it undergoes a fission reaction, resulting in the formation of two new nuclei and neutrons. The following equation is an example of one such fission process: 235-U + 1-n→A-Ba + 94-Kr + 31-n Enter the isotope symbol for the barium (Ba) nucleus in this reaction. Express your answer as an isotope.