CHAPTER 22 Nuclear Chemistry

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CHAPTER 22 Nuclear Chemistry. II. Radioactive Decay (p. 705 - 712). I. II. III. IV. A. Types of Radiation. Alpha particle ( ) helium nucleus. paper. 2+. Beta particle ( -) electron. 1-. lead. Positron ( +) positron. 1+. concrete. Gamma ( ) high-energy photon. 0. - PowerPoint PPT Presentation

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  • CHAPTER 22

    Nuclear ChemistryII. Radioactive Decay(p. 705 - 712)IIVIIIII

  • A. Types of RadiationAlpha particle ()helium nucleuspaper2+Beta particle (-)electron1-leadPositron (+)positron1+Gamma ()high-energy photon0concrete

  • B. Nuclear DecayAlpha EmissionNumbers must balance!!

  • B. Nuclear DecayBeta EmissionPositron Emission

  • B. Nuclear DecayElectron CaptureGamma EmissionUsually follows other types of decay.Transmutation One element becomes another.

  • B. Nuclear DecayWhy nuclides decayneed stable ratio of neutrons to protonsDECAY SERIES TRANSPARENCY

  • C. Half-lifeHalf-life (t)Time required for half the atoms of a radioactive nuclide to decay.Shorter half-life = less stable.

  • C. Half-lifemf:final massmi:initial massn:# of half-lives

  • C. Half-lifeFluorine-21 has a half-life of 5.0 seconds. If you start with 25 g of fluorine-21, how many grams would remain after 60.0 s?GIVEN:t = 5.0 smi = 25 gmf = ?total time = 60.0 sn = 60.0s 5.0s =12 WORK:mf = mi ()nmf = (25 g)(0.5)12mf = 0.0061 g