CHAPTER 22 Nuclear Chemistry

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Presentation transcript:

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

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

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

B. Nuclear Decay Beta Emission electron Positron Emission positron

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

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

C. Half-life Half-life (t½) Time required for half the atoms of a radioactive nuclide to decay. Shorter half-life = less stable.

C. Half-life mf: final mass mi: initial mass n: # of half-lives

C. Half-life t½ = 5.0 s mf = mi (½)n mi = 25 g mf = (25 g)(0.5)12 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: t½ = 5.0 s mi = 25 g mf = ? total time = 60.0 s n = 60.0s ÷ 5.0s =12 WORK: mf = mi (½)n mf = (25 g)(0.5)12 mf = 0.0061 g

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