After 2 half-lives there will be 25% (1/4th) of the original isotope, and 75% (3/4 th) of the decay product
A half life is a measurement of the slope of an exponential decay function.
It is also defined as, the time it takes to halve the concentration of something in a process.
Each half life you will have half of what you had at the beginning of a given half life.
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