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Likewise, radiocarbon dating can provide information on the extent of such mixing.

The processes involved which may mix chemically, physically, or biologically the C atoms of the sample are outlined, and the methods used in practice to reverse this mixing are described.

But you can predict how long it will take a large group of atoms to decay.

The element's half-life is the amount of time it takes for half the parent atoms in a sample to become daughters.

Usually, atoms have an equal number of protons and neutrons.