What fraction of a radioactive element will be left after 4 half-lives have elapsed?

The fraction of a radioactive element left after nn half-lives can be found using the formula:
Fraction remaining=(1/2)n

For n=4 half-lives:

Fraction remaining=(1/2)4=1/16\

So, after 4 half-lives, 1/16 of the original amount of the radioactive element will remain.

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