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I'm not exactly sure but it's probably: electrons, neutrons, and protons.

The electron is the smallest particle of the atom, in the traditional sense. However, the neutrino is far smaller than the electron, and is thus the smallest particle. You could also argue that the photon, with zero rest mass, is actually the smallest, but that's a quantum mechanics question that seems to be beyond the scope of this question.

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13y ago

What else can I help you with?