# Half-life

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Number of
half-lives
elapsed
Fraction
remaining
Percentage
remaining
0 1/1 100
1 1/2 50
2 1/4 25
3 1/8 12.5
4 1/16 6.25
5 1/32 3.125
6 1/64 1.563
7 1/128 0.781
... ... ...
$n$ $1/2^n$ $100(1/2^n)$

A radioactive half-life is the amount of time that it takes for a mass of a given element to decay to one half of its original mass.

The table at the right shows the amount of element left after each half-life. At the bottom is the most general form of the half-life equation.