Chem P Lecture Slides for Sept 22 - Radioactivity Make sure...

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9/23/14 1 Radioactivity Make sure to get the handout today. Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting radiation in the form of particles or electromagnetic waves . There are numerous types of radioactive decay. An unstable nucleus releases energy to become more stable All Known Nuclides
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9/23/14 2 * atomic number (Z) – number of protons in the nucleus * mass number (A) – sum of the number of protons and neutrons * isotopes – atoms with identical atomic numbers but different mass numbers * nucleons – particles found in the nucleus of an atom * neutrons * protons Alpha Particle (Helium Nucleus) Parent Nucleus Am-241 U-238 Th-232 Ra-226 Daughter Nucleus Np-237 Th-234 Ra-228 Rn-222 4 2 α +2
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9/23/14 3 * Alpha ( α ) Decay A nucleus emits an Alpha particle (2 protons and 2 neutrons). Net effect is loss of 4 in mass number and loss of 2 in atomic number. Often seen with large nuclei.
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