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Earth Science Geologic History Mrs. LeMieux Radioactive Dating Vocabulary Element: a substance consisting of atoms that are chemically alike. Isotope: one variety of an element with the same atomic number, but different atomic mass and physical properties. Example: Carbon12 and Carbon14 Radioactive Decay: when unstable atoms of an element breakdown into stable atoms. The stable atom may be the same element or a different element. Half-life: time required for half of the atoms in a given amount of an unstable isotope to decay or change into a different isotope. Radioactive Dating: using radioactive isotopes to determine the absolute age of rocks or geologic events (like volcanoes and meteor strikes). Carbon-14 dating: Using Carbon14 to date rocks and organic remains that are less than 50,000 years old.
