Ready for chemistry 101?
First lesson: Definition of half-life from About.com;
Definition: The time required to convert one half of a
reactant to product. The term is commonly applied to radioactive decay, where
the reactant is the parent isotope and the product is a daughter isotope.
Now that that's out of the way, the longest half-life
belongs to SE-82, an isotope of Selenium.
SE-82 has a half-life of 1.3*1020 years
which expands out to 130,000,000,000,000,000,000 years or simply 130 quintillion
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