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Worksheet: Radioactive Decay and Half-life Name:________________ Period:_________ Date:_________ 1. Balancing the following nuclear reactions. Use nuclear notations for the unknowns. 0 a. 207 84 Po 1 _____ Es 24He 01n _____ b. 253 99 c. 14 7 d. 249 99 258 Po _____ 103 Lr 401n _____ e. 238 93 Np 10 _____ f. 239 96 g. 2 1 h. 238 92 i. 7 4 j. 131 53 N 24He 178O _____ Cm126C 4 01n _____ H 12H 01n _____ U 12H 2 01n _____ Be 10 _____ I 10 _____ 2. Write balanced equations for the following nuclear reactions. a. Uranium-233 undergoes one alpha decay b. Neptunium-239 undergoes three alpha decays c. Copper-66 undergoes two beta decays d. Phosphorus-33 undergoes one beta decay 3. Write a balanced equation for the fission of uranium-235 by a neutron into uranium-236 which then further decays into barium-139, krypton-94, and three neutrons. 4. In solar fusion, four hydrogen nuclei (protons) combine with two beta particles to produce an alpha particle. Write the balanced equation for that nuclear reaction. 5. A sample initially contains 60.0 grams of thorium-234. After 48 days, only 7.5 grams of thorium remains. Determine the half-life. 6. Technetium-104 has a half-life of 18 minutes. Starting with an initial mass of 100.0 grams, how much would remain after 15.6 hours? 7. Manganese-56 is a beta emitter with a half-life of 2.6 hours. Starting with a 10.0 grams sample, how much would remain after 15.6 hours? 8. F 20.0 grams of element Xenaium remains after 72 days, determine the mass of the original sample. The half-life of Xenaium-234 is 12 days.