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All three isotopes have the same atomic number of 6, but have different numbers of neutrons.
After death, the carbon-14 decays and is not replaced.
The rate of decay is a fixed rate called a half-life.
The half-life of a radioactive isotope refers to the amount of time required for half of a quantity of a radioactive isotope to decay.
Isotopes have the same chemical properties, but different physical properties.
An example of isotopes is carbon, which has three main isotopes, carbon-12, carbon-13 and carbon-14.