periodic table half lives - Search
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    Half-life is the time it takes for a sample of an element to be reduced by half. Half-lives range from millionths of a second for highly radioactive fission products to billions of years for long-lived materials such as naturally occurring uranium. The further along an element is on the periodic table, the higher its atomic number, the less time it lasts. After five half-lives have elapsed, only 1/32, or 3.1%, of the original number of atoms remains. After seven half-lives, only 1/128, or 0.78%, of the atoms remains.
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