radioactivity

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Author:
murphyainec
ID:
115451
Filename:
radioactivity
Updated:
2011-11-08 13:54:46
Tags:
chemistry
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Description:
chapter 8
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  1. who discovered radioactivity?
    henri becquerel
  2. who discovered polonium and radium
    pierre and marie curie
  3. define radioactivity
    spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation
  4. three types of radiation
    • >alpha
    • >beta
    • >gamma
  5. what are alpha particles
    helium nuclei (two protons two neutrons)
  6. what are beta particles
    electrons
  7. how is radiation detected
    geiger-muller tube
  8. half life of an element
    life taken for half the nuclei in any given sample to decay
  9. what are radioisotopes used in?
    • >archaeology
    • >agricultural research
    • >food irradiation
    • >smoke alarms
    • >in industry
  10. what happens when an atom loses an alpha particle
    changes into an atom of an element two places before it.. mass number decreases by four
  11. what happens when an atom loses a beta particle
    changes into an atom of an element one place after it.. mass number stays the same

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