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Nuclear Chemistry WS #2 Mass Defect Name ________________ 1. The mass of Neon-20 atom is 19.99244 amu. Calculate the atom’s mass defect. 2. Calculate the nuclear binding energy of one lithium-6 atom. The measured atomic mass of lithium-6 is 6.015 amu. 3. Write the nuclear equation for the release of an alpha particle by Polonium-210 4. Write the nuclear equation for the release of a beta particle by Lead-210 Nucleus Stability 5. Determine which type of decay (alpha, beta, electron capture or positron emission) each of the following isotopes will undergo. Once determined, write out the nuclear decay equation for each. a. Uranium-235 b. Oxygen-16 c. Iron-56 d. Neodymium-156 Half Life 6. The half life of plutonium-239 is 24110 years. Of an original mass of 100 g how much plutonium-239 remains after 96440 years? 7. The half life of thorium-227 is 18.72 days. how many days are required for 3/4 of a given amount of thorium-227 to decay? 8. How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years? The half life of radium-226 is 1599 years. Transmutation 9. What is artificial transmutation? 10. Why are neutrons more effective for bombarding atomic nuclei than protons or alpha particles are. Why?
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