Chemistry Homework Solutions
Problem
#19153

Half life word problems

Radioisotopes such as aluminum -26, which is believed to have been present in the solar system when earth was formed but can no longer be detected, are known as extinct radionuclides.  The half-life for the decay of aluminum -26 is 7.20 x 10 ^5 years.  

How many years did it take for 99.99% of the aluminum -26 to decay?  If Earth was formed 4.6 x10^9 years ago, what percentage of the aluminum-26 present when the solar system was formed is still present today?

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