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15.Nucl_chem_Part_2_

15.Nucl_chem_Part_2_ - Chapter 15 Nuclear Chemistry part 2...

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Periodic Table on the web: updated link! http://periodic.lanl.gov/index.shtml http://www.ptable.com/ (This table is interactive; it was recommended by Aaron Zull) A Bonus Quiz will be posted on Blackboard On Thursday March 30, at 5:00 PM -------------------- Chapter 15: Nuclear Chemistry, part 2
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Nuclear symbol A Z X Z = the number of protons ( atomic number ) (we use the periodic table to identify the element with a given number of protons) The number of protons also defines the number of positive charges in an element A = the number of protons plus neutrons ( mass number ) --- Examples: 4 2 He 232 90 Th 228 88 Ra 14 6 C
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Band of Stability In plots of Z (number of protons) vs . N (number of neutrons), stable nuclides (specific isotope) are distributed within the stability band (blue dots) Nucleus of atoms that fall outside the stability band are unstable Unstable nuclides are radioactive To attain stability, unstable nuclides undergo nuclear decay ---
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Alpha emission Emission of an α particle removes 2 protons and 2 neutrons from a decaying nuclide
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