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The fundamental subatomic particles that have no (currently known) substructure. These include fermions (quarks, leptons, antiquarks, and antileptons) and bosons (gauge bosons and the Higgs boson). A particle containing two or more elementary particles is a composite particle.

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Can an electron pass through a gap smaller than an electron?

In the prevailing theories, the electron can be considered a point particle. There is no space too small for a point to fit through.
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