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After two half-lives, another half of your leftover Carbon-14 would have decayed into Nitrogen-14.

Half of 50% is 25%, so you would have 25% Carbon-14 and 75% Nitrogen-14.

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Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into.

Let's say you found a fossil you think to be a human skeleton.

Our updated Terms of Service explains our agreement with you to use our Services.As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.This is what your readout said, so your fossil has undergone two half-lives.Now that you know how many half-lives have passed for your fossil, you need to multiply your number of half-lives by how many years are in one half-life. Your fossil is of an organism (maybe human) that died 11,460 years ago.

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