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

READ:
Chemistry Exam & Test Cheat Sheet

= 4.6 x 109 years

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

READ:
The Equilibrium Constant (K)

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