Radioactive carbon and stable carbon are both isotopes of carbon. This means that they have the same number of protons (6) and electrons (6), but they differ in the number of neutrons. Radioactive carbon, also known as carbon-14, has 8 neutrons, while stable carbon, also known as carbon-12, has 6 neutrons.

Despite this difference in neutron number, radioactive carbon and stable carbon have many similarities. For example, both isotopes of carbon can form chemical bonds with other elements, and both can exist in different chemical compounds. Additionally, both radioactive carbon and stable carbon can be cycled through the biosphere, the atmosphere, and the oceans.

However, there are also some key differences between radioactive carbon and stable carbon. Radioactive carbon is unstable, meaning that it will eventually decay into nitrogen-14. This process of radioactive decay is what makes carbon-14 useful for radiometric dating, a technique used to determine the age of objects by measuring the amount of radioactive carbon they contain. Stable carbon, on the other hand, is not radioactive and therefore does not decay. This makes carbon-12 a useful standard for measuring the relative abundance of different isotopes in samples.

Overall, radioactive carbon and stable carbon are both important isotopes of carbon that have distinct properties and applications.