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Some atoms eventually change from one element to another by a process called radioactive decay.If there are many atoms of the original element, called the parent element, the atoms decay to another element, called the daughter element, at a predictable rate.By the time ten of these intervals, or half-lives, have passed, less than one thousandth of the original number of radioactive atoms is left.
In the next time interval, with only one-fourth remaining, only one eighth of the original total will decay.
Radiometric dating The process of determining the age of rocks from the decay of their radioactive elements has been in widespread use for over half a century .
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