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It is a great introduction to the scientific process of deducing, forming scientific theories, and communicating with peers.

It is also useful in the mathematics classroom by the process of graphing the data.

All three isotopes have the same atomic number of 6, but have different numbers of neutrons.

Carbon-14 has 2 more neutrons than carbon-12 and 1 more than carbon-13, both of which are stable.

Seeing this connection will help students to understand how scientists can determine the age of a sample by looking at the amount of radioactive material in the sample.

If two nuclei have different masses, but the same atomic number, those nuclei are considered to be isotopes.

The carbon-14 decays, with its half-life of 5,730 years, while the amount of carbon-12 remains constant in the sample.