Which radioactive isotope is used in biological dating

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There are 82 stable elements and about 275 stable isotopes of these elements.When a combination of neutrons and protons, which does not already exist in nature, is produced artificially, the atom will be unstable and is called a radioactive isotope or radioisotope.An "isotopically labeled compound" has one or more of its atoms enriched in an isotope.Stable isotopes are tools used by researchers worldwide in the diagnosis of disease, to understand metabolic pathways in humans, and to answer fundamental questions in nature.The great importance of the atomic number derives from the observation that all atoms with the same atomic number have nearly, if not precisely, identical chemical properties.A large collection of atoms with the same atomic number constitutes a sample of an element.These electrons determine the chemistry of the atom.

» View Examples of Stable Isotope Compounds Many of the chemical elements have a number of isotopes.A bar of pure uranium, for instance, would consist entirely of atoms with atomic number 92.The periodic table of the elements assigns one place to every atomic number, and each of these places is labeled with the common name of the element, as, for example, calcium, radon, or uranium.In most cases, the information is used by physicians to make a quick, accurate diagnosis of the patient's illness.The thyroid, bones, heart, liver and many other organs can be easily imaged, and disorders in their function revealed.

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