Nuclei are the central core of an atom, containing protons and neutrons, which collectively make up most of the atom's mass. The arrangement and number of these particles in a nucleus determine the element and its isotopes, playing a critical role in the stability of atoms. Understanding nuclei is essential for exploring concepts related to nuclear stability and how different isotopes interact within the chart of nuclides.
congrats on reading the definition of nuclei. now let's actually learn it.