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21 December, 21:35

How many milligrams remain of a 15.0 mg sample of radium-226 after 6396 years? The half life of radium-226 is 1599 years.

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  1. 21 December, 21:38
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    There are 4 half lives of radium-226 in 6396 years. 15.0 divided by half 4 times (15.0/2 = 7.5, 7.5/2 = 3.75, 3.75/2 = 1.875) equals 1.875 mg of radium-226.
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