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OpenStudy (anonymous):

Uranium-238 has a half-life of 4.5 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth? 10 percent 25 percent 50 percent 75 percent

OpenStudy (aaronq):

original isotopes % = 4.5 billion years/4.6 billion years x 100 daughter % = 100 - original

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