Uranium-238 has a half-life of 4.5 billion years.You have a rock that formed with 100,000 uranium-238 molecules.How many uranium-238 molecules will be left in 4.5 billion years?

Name: Uranium-238 has a half-life of 4.5 billion years.You have a rock that formed with 100,000 uranium-238 molecules.How many uranium-238 molecules will be left in 4.5 billion years?
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In 4.5 billion years, half of the original 100,000 uranium-238 molecules would have decayed, leaving 50,000 molecules.

Uranium-238 Has a Half-Life of 4