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By measuring the ratio of the radio isotope to non-radioactive carbon, the amount of carbon-14 decay can be worked out, thereby giving an age for the specimen in question.

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It is called "Carbon-12," which is abbreviated "C." The fact that the atom has six protons is what makes it carbon.

Most nitrogen atoms have seven protons and seven neutrons, so their atomic mass is 7 7 = 14.

The fact that it has seven protons is what makes it nitrogen.

Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.

By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.

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