The half-life of actinium-227, a radioactive isotope, is 22 years. about how long would it take 10 grams of the isotope to decay until there were only 2.5 grams left? show your work !

44 years will take for 10 grams of Actinium to decay until there were only 2.5 grams.

Explanation:

The half life it tell you about the time in which half of the quantity of the isotope will decay.

time (years)          quantity of isotope (grams)

     0                                       10

    22                                      5

    44                                     2.5

precipitation

explanation:

when it goes from cloud to rain/back to earth in the form of rain

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