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Radiometric dating (often called radioactive dating) is a technique used to date materials, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

A particular isotope of a particular element is called a nuclide. That is, at some point in time, an atom of such a nuclide will spontaneously transform into a different nuclide.

Al against the Pb-Pb system yields a plausible timescale for the early solar system.

In this system, the earliest chondrule ages are most readily interpreted as representing formation after the beginning of parent body processing.

Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.

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Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials.Various methods exist differing in accuracy, cost and applicable time scale.All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.After one half-life has elapsed, one half of the atoms of the substance in question will have decayed.Many radioactive substances decay from one nuclide into a final, stable decay product (or "daughter") through a series of steps known as a decay chain.

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