Nucleus
Nucleus (atomic structure), in atomic structure, the positively charged central mass of an atom about which the orbital electrons revolve. The nucleus is composed of nucleons, that is, protons and neutrons, and its mass accounts for nearly the entire mass of the atom.
See Elementary Particles; Neutron; Proton.
See also: Nuclear Energy; Electron
See Elementary Particles; Neutron; Proton.
See also: Nuclear Energy; Electron