C. Johannesson CHAPTER 22 Nuclear Chemistry II. Radioactive Decay (p. 705 - 712) II. Radioactive Decay (p. 705 - 712) I IV III II.

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C. Johannesson CHAPTER 22 Nuclear Chemistry II. Radioactive Decay (p ) II. Radioactive Decay (p ) I IV III II

C. Johannesson A. Types of Radiation  Alpha particle (  )  helium nucleus paper 2+  Beta particle (  -)  electron 1- lead  Positron (  +)  positron 1+  Gamma (  )  high-energy photon 0 concrete

C. Johannesson B. Nuclear Decay  Alpha Emission parent nuclide daughter nuclide alpha particle Numbers must balance!!

C. Johannesson B. Nuclear Decay  Beta Emission electron  Positron Emission positron

C. Johannesson B. Nuclear Decay  Electron Capture electron  Gamma Emission  Usually follows other types of decay.  Transmutation  One element becomes another.

C. Johannesson B. Nuclear Decay  Why nuclides decay…  need stable ratio of neutrons to protons DECAY SERIES TRANSPARENCY

C. Johannesson C. Half-life  Half-life (t ½ )  Time required for half the atoms of a radioactive nuclide to decay.  Shorter half-life = less stable.

C. Johannesson C. Half-life m f :final mass m i :initial mass n:# of half-lives

C. Johannesson C. Half-life  Fluorine-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 ½ = 5.0 s m i = 25 g m f = ? total time = 60.0 s n = 60.0s ÷ 5.0s =12 WORK : m f = m i (½) n m f = (25 g)(0.5) 12 m f = g

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