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Numbers of isotopes per element In total, there are 252 nuclides that have not been observed to decay. For the 80 elements that have one or more stable isotopes, the average number of stable isotopes is 252/80 = 3.15 isotopes per element.
There are 254 known stable isotopes and 80 elements which have at least one stable isotope. Twenty-six elements only have one stable isotope. These elements are called monoisotopic.
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