Bound State

This is a state in which a particle is confined within a composite system, for example an atom or a nucleus, because it does not have enough energy to escape. An electron in a atom is bound because of its electrical attraction to the nucleus, which makes the mass of the atom slightly less than the sum of the masses of the electron plus the rest of the atom without that electron.

See also: Atom, Nucleus.

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Subjects: Nuclear and Particle Physics