Half-Life Definition

Chemistry Glossary Definition of Half-Life

illustration of hand reaching for radioactive symbol
An element's half-life is one way to gauge its radioactivity.

Jutta Kuss,/fStop Images/Getty Images

Half-Life 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.