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Dmitry_Shevchenko [17]
3 years ago
5

Please help asap. Didn’t have the right subject so i used the one closest to it.

Chemistry
1 answer:
liraira [26]3 years ago
5 0

Answer:

6th period

Explanation:

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The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?
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a=64.7mg

Explanation:

Hello,

In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }

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a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg

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