Why Do Isotopes Exist?

Answer

Isotopes exist because they assist in determining the age of a material which is made up of isotopic elements. For example the age of trees that lived quite a number of years back can be determined by the carbon isotope that constitutes the tree.
Q&A Related to "Why Do Isotopes Exist?"
Because stable nuclei can be formed with different mass numbers.
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There are three naturally occurring isotopes of carbon in existence:
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The greater the number of isotopes, the more these affected the overall measure of the element's mass. report this answer. Updated on Thursday, February 02 2012 at 10:13AM EST. Source
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