Atomic
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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.
b.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 matter so minute as to admit of no division.
4.anything extremely small; a minute quantity.
