Absolute Dating Chapter 3, Sec.3. Process to find the approximate age of rocks or fossils.

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Presentation transcript:

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

Every element has a diff. # of protons

Isotopes Atoms of the same element with different # of neutrons

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

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

Decay occurs at a constant rate called half-life

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

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

Some unstable isotopes decay into stable isotopes

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