12.5g of a 100.-g sample remains after 7.50 days.
Half-life is the amount of time required for a substance's radioactivity to decrease to half its initial value, whereas mean life is the average lifetime of all the nuclei of a specific unstable atomic species.
Knowing about half-life is helpful for calculating steady-state concentrations and excretion rates for each particular drug.
Despite the fact that individual medications' half-lives vary, they always adhere to the same principle: 50% of the initial drug dose leaves the body after one half-life.
The half-life of xenon-124, or the typical amount of time needed for a collection of xenon-124 atoms to decay by half, is about 18 sextillion years (1.8 x 1022 years), or roughly 1 trillion times the universe's present age.
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