radiometric dating lecture

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Radiometric dating - internal clocks in rocks Geochronology: Radioactive decay occurs at an exponential rate, meaning that it can be radiometric dating lecture in terms of a half life. After one half live, half of the original radioactive isotope material in the system under consideration decays. Another half life and half of the remaining material decays, and so on.

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Focus Questions: How can we measure the numerical age of rock layers? Read Chapters 4 and 6. A word about atoms…. Chemical reactions involve the electrons of an atom, not the nucleus. The number of protons in the nucleus of an atom is the Atomic Number, and identifies the element. An atom with 8 protons is an atom of Oxygen. An atom with 7 protons is an atom of Nitrogen. The number of protons plus the number of neutrons is the Atomic Mass. There are 3 isotopes of carbon: