THE WORLD'S LONGEST HALF-LIFE
THE LONGEST LIST OF THE LONGEST STUFF AT THE LONGEST DOMAIN NAME AT LONG LAST

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 years.

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