Posted by **melissa** on Wednesday, December 10, 2008 at 5:24pm.

the half-life of polonium-218 is 3.0 minutes. what percentage of the original sample remains after 4 half-lives?

- chemistry -
**bobpursley**, Wednesday, December 10, 2008 at 5:26pm
amount left= (1/2)^4=1/2^4=1/4^2=1/16

- chemistry -
**bob**, Thursday, May 19, 2011 at 9:23pm
The half-life of polonium-218 is 3.0 min. If you start with 16 mg of

polonium-218, how much time must pass for only 1.0 mg to remain?

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