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November 3,2011. Objective: Determine half life of pennies. Agenda: Notes Fossils Lab : Radioactive Decay Review for test. WHAT IS RADIOACTIVE DATING?. Most elements exist in several forms. These are isotopes. Example: Carbon. Radioactive decay. Same atomic # = same # of protons.

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Objective:Determine half life of pennies

  • Agenda:
    • Notes
    • Fossils
    • Lab: Radioactive Decay
    • Review for test
radioactive decay
Radioactive decay
  • Same atomic # = same # of protons.
  • Different atomic mass = different # of neutrons.
      • The nucleus contains protons and neutrons, which is most of the mass.
      • Some atoms have an unstable nucleus.
        • These atoms are radioactive.
        • These elements can turn into other elements.
        • This is called radioactive decay.
half life
Half-life
  • The half-life of an isotope is the amount of time it takes for exactly half of the atoms to decay. At the end of one half-life, half of the original atoms will have decayed.
  • 1st half-life 1/2 of original left
  • 2nd half-life 1/4 of original left
  • 3rd half-life 1/8 of original left
  • 4th half-life 1/16 of original left
radioactive dating
Radioactive dating
  • Half-lives can be used to estimate the age of rocks. We usually need to use isotopes with long half-lives because rocks can be billions of years old.
radioactive isotopes
Radioactive Isotopes

Carbon -14 has a short half-life of 5700 years.

Uranium-238has an extremely long half-life of 4.5 billion years.

Potassium-40has a half-life of 1.25 million years.

westmoreland state park
Westmoreland State Park

http://www.fossilguy.com/sites/potomac/

fossil observations
Fossil observations
  • Draw 7 fossils
  • Observation
  • Inference