Atom
The smallest particle of an element that can exist and still retain the ordinary chemical properties of that element.
See also: Absorption Spectrum, Angular Momentum Quantum Number, Atomic Radius, Atomic Theory, Atomic weight, Aufbau Principle, Bohr Atom, Density Functional Theory, Electron Affinity, Electron Configuration, Excited State, Ground State, Hunds Rule, Metallic Radius, Nuclear Binding Energy, Nucleus, Nuclide, Orbital, Subatomic, Valence Electrons.
