219 In the 235-Uranium decay chain, 235At can undergo alpha decay or electron beta decay. Write both decay reactions and calculate the Q values based on mass change. Which decay would you expect to see more often and why?

1) Complete the following nuclear fission reaction of thorium-232. 232Th + n → 99Kr + 124Xe +      ?      a) 4He b) 10B c) 10n d) 11n  e) 11B  2) Calculate the energy released in the reaction. The atomic masses are 232Th = 232.038051 u, 99Kr = 98.957606 u, and 124Xe = 123.905894 u. (Express your answer to five significant figures).

In the figure below, note that for low Z, all the nucleii with the most highest binding energy per nucleon have both an even number of protons and an even number of neutrons. Explain why this is. 9 soFe 9%Mo 160 8. 144N. 183W He 20sPb "Be 235U 6. Fusion reactions release energy Fission reactions release energy 1 40 80 120 160 200 240 Atomic Mass Number (A) Use the editor to format your answer E (MeV)

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