A uranium-235 nucleus absorbs a neutron and undergoes the fission reaction ²³⁵₉₂U + ¹₀n → ¹⁴⁴₅₆Ba + ᴬ₃₆Kr + 3(¹₀n). If A is the mass number of the krypton fragment, find A.
Physics · Nuclear physics · nuclear fission and fusion ,nuclear reactor
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Question

A uranium-235 nucleus absorbs a neutron and undergoes the fission reaction ²³⁵₉₂U + ¹₀n → ¹⁴⁴₅₆Ba + ᴬ₃₆Kr + 3(¹₀n). If A is the mass number of the krypton fragment, find A.

Physics · Nuclear physics · nuclear fission and fusion ,nuclear reactor

G1 Physics · Accepted Answer

Conservation of mass number gives 235+1 = 144+A+3. Thus, 236 = 147+A. Therefore, A = 236−147 = 89. Atomic-number conservation is already satisfied because 56+36 = 92. Hence A = 89.