Radiometric dating accuracy

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The illustration below shows the three isotopes of carbon.

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Carbon-14 is mostly used to date once-living things (organic material). Carbon-14 is constantly being added to the atmosphere.Protons and neutrons make up the center (nucleus) of the atom, and electrons form shells around the nucleus.The number of protons in the nucleus of an atom determines the element.So, a carbon atom might have six neutrons, or seven, or possibly eight—but it would always have six protons.An “isotope” is any of several different forms of an element, each having different numbers of neutrons.

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