lec 7 chem 6c

lec 7 chem 6c - Class Average (65.4%) High (100%) Low (15%)...

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Unformatted text preview: Class Average (65.4%) High (100%) Low (15%) x3 E1 Histogram 10 20 30 40 50 1 5 2 2 5 3 3 5 4 4 5 5 5 5 6 6 5 7 7 5 8 8 5 9 9 5 1 Exam % # o f S t u d e n t s A B C D F Remember if you do not like your current grade, start studying You can drop one grade and the Final is worth 50% of your grade! Grade Distribution 20 40 60 80 100 F D C B A Letter Grade # o f S t u d e n t s Preview Definitions Types of nuclear decay Isotopes Atomic Number (Z) Mass Number (A) Number of protons Number of neutrons plus protons The same number of protons, but different mass number Z X A 6 C 12 6 C 13 6 C 14 Carbon-12 Carbon-13 Carbon-14 Different Isotopes of Carbon Neutrons + Protons Just Protons # of neutrons = A-Z The nuclear stability of an element (like everything else) depends on both thermodynamics and kinetics, but we will define each a little differently for nuclear decay. Thermodynamic Stability The potential energy of a particular nucleus compared to the sum of the potential energies of its component protons and neutrons. Kinetic Stability The probability that a nucleus will undergo decomposition to form a different nucleus (radioactive decay) Unstable Region: Too many protons Unstable Region: Too many neutrons There are many different types of radioactive decay, and we will discuss each one according to its role in obtaining a stable molecule -particle (-ray) 234 Th 90 Ex.Ex....
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This note was uploaded on 03/21/2009 for the course CHEM 6C taught by Professor Hoeger during the Spring '08 term at UCSD.

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lec 7 chem 6c - Class Average (65.4%) High (100%) Low (15%)...

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