The term "even atomic nucleus" refers to a nucleus that has an equal number of protons and neutrons. This results in a stable configuration and a balanced positive charge. Synonyms for the term "even atomic nucleus" include "stable nucleus," "balanced nucleus," and "symmetrical nucleus." This type of nucleus is also referred to as an "isotope" or "nuclide." Even atomic nuclei can be found in elements such as carbon-12, oxygen-16, and nitrogen-14. These elements are common in the universe and make up a significant portion of Earth's atmosphere and living organisms. Understanding even atomic nuclei is important for the fields of chemistry, physics, and nuclear medicine.