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­ ­You probably have seen or read news stories about fascinating ancient artifacts.

By measuring the amount of carbon-14 left in the organism, it's possible to work out how old it is.

Recall that atoms are the basic building blocks of matter.

Atoms are made up of much smaller particles called protons, neutrons, and electrons.

This is how carbon dating works: Carbon is a naturally abundant element found in the atmosphere, in the earth, in the oceans, and in every living creature.

C-12 is by far the most common isotope, while only about one in a trillion carbon atoms is C-14.