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Unformatted text preview: 1 β or 1 e Highspeed electrons; atomic number increases gamma ( γ ) ray γ Highenergy photons; often accompanies other decay like electron capture positron 1 β or 1 e Atomic number decreases electron capture1 e Addition of electron(s) with production of γ rays fission n Neutron capture causes chain reactions Fission of 238 U Chain Reaction Nuclear Equations – sum of both mass and atomic numbers on both sides of equation are equal Examples: 68 31 Ga + 1 e → _____ 212 87 Fr → 208 85 As + ______ 263 106 Sg → ______ + 4 2 He 21.4 Rates of Radioactive Decay Radioactive decay follows 1 st order kinetics. All halflives are equal. kt N N t= ln N – # of radioactive nuclei k – decay constant Individual halflives vary tremendously 214 Po 2 x 104 s 144 Nd 5 x 10 15 year k t 693 . 2 / 1 = Halflives Practice problem...
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This note was uploaded on 04/07/2008 for the course CHEM 213 taught by Professor Miertschin during the Spring '08 term at Winona.
 Spring '08
 MIERTSCHIN
 Electron, Proton, Subatomic Particles, Isotopes, Nuclear Chemistry

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