1. Physics. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element. an atom with one of the electrons replaced by some other particle: muonic atom; kaonic atom.
2. Energy. this component as the source of nuclear energy.
3. a hypothetical particle of mat
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