Chemistry
calliejo
2017-08-16 10:28:30
PLEASE HELP!!! WILL MEDAL AND LIKE The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of the radioactive atoms in it remain? 
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Everette523
2017-08-16 15:50:08

128 i believe Hope this helps!

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