• Radioactive decay is the breakdown of unstable elements into stable elements.
  • Atoms of an element with different numbers of neutrons are called isotopes.
  • Carbon dioxide forms in the atmosphere from carbon-14 and oxygen.
  • Carbon-14 has a half-life of 5,730 years.
  • The rate of decay of a radioactive substance is constant over time.
  • The decay rate of an unstable isotope to a stable element occurs at a constant rate.
  • The half- life is the time it takes for half of a given amount of an isotopes to decay.
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