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An atom whose nucleus is not stable.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
 
An atom whose nucleus is not stable.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
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Radioactive isotopes have many applications in science and medicine.  One application is carbon 14 dating.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/cardat.html</ref>  This allows scientists to estimate the age of remains of living things that lived more than 10,000 years ago.
    
==References==
 
==References==
http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/cardat.html
   
<references/>
 
<references/>
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