What is Half-Life? (Chemistry)

Period after which only half of the original number of nuclei in a sample of a radioactive element have not decayed.

ex. half-life for uranium – 238 ²³⁸₉₂U

= 4.6 x 10⁹ years

So after 4.6 x 10⁹ years, only one half of the original uranium will be left

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