Radium-221 has a half-life of 30 seconds. How long will it take for 77% of a sample to decay?

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- March 25th 2009, 02:58 PMcheer4life1694Chemistry and Exponential Models
Radium-221 has a half-life of 30 seconds. How long will it take for 77% of a sample to decay?

- March 25th 2009, 03:31 PMskeeter