Chemistry, 21.07.2019 05:20 watsonjessalynn

Radium-221 has a half-life of 30 sec. how long will it take for 87% of a sample to decay? (round your answer to the nearest whole number.)

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Radium-221 has a half-life of 30 sec. how long will it take for 87% of a sample to decay? (round yo...

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