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Absolute Dating

Absolute Dating. Chapter 3, Sec.3. Process to find the approximate age of rocks or fossils. Atoms. Smallest part of matter Made of protons, neutrons, electrons Center called the nucleus. Everything is made of atoms. Protons, neutrons in nucleus Electrons move around nucleus.

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Absolute Dating

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  1. Absolute Dating Chapter 3, Sec.3

  2. Process to find the approximate age of rocks or fossils

  3. Atoms • Smallest part of matter • Made of protons, neutrons, electrons • Center called the nucleus

  4. Everything is made of atoms

  5. Protons, neutrons in nucleus • Electrons move around nucleus

  6. Every element has a diff. # of protons

  7. Isotopes • Atoms of the same element with different # of neutrons

  8. Radioactive Decay • Most atoms are stable • Some are unstable and breakdown or decay (radioactive)

  9. High energy particles are given off • Can damage cells, organs, etc.. • X-rays, gamma rays, electrons, protons, neutrons

  10. Decay occurs at a constant rate called half-life

  11. Half-life • The time it takes for one-half of a sample to decay

  12. Problem • I start with 10 grams of a sample • It’s half-life is 20 years • After 20 years, how much left? • After 40 years, how much left 5 grams 2.5 grams

  13. Some unstable isotopes decay into stable isotopes

  14. 3 radioactive dating methods • Uranium-Lead Method • Potassium-Argon Method • Carbon-14 Method

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