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It is called 'radio'-carbon, because it is 'radioactive'.

This means that its atomic structure is not stable and there is an uneasy relationship between the particles in the nucleus of the atom itself.

Libby found that it took 5568 years for half the radiocarbon to decay.In the 1940s, scientists succeeded in finding out how long it takes for radiocarbon to disappear, or decay, from a sample of carbon from a dead plant or animal.Willard Libby, the principal scientist, had worked in the team making the nuclear bomb during World War 2, so he was an expert in nuclear and atomic chemistry.Eventually, a particle is emitted from the carbon 14 atom, and carbon 14 disappears.Most of the carbon on Earth exists in a slightly different atomic form, although it is chemically speaking, identical to all carbon.

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