#elementary_particle__fundamental_particle__fundamentalparticle__subatomicparticle a particle that is less complex than an atom; regarded as constituents of all matter
supertype: #particle a body having finite mass and internal structure but negligible dimensions
part of: #atom
subtype: #antilepton the antiparticle of a lepton
subtype: #antimuon__positive_muon the antiparticle of a muon; decays to positron and neutrino and antineutrino
subtype: #antineutrino the antiparticle of a neutrino
subtype: #antitauon__tau-plus_particle an antilepton of very great mass
subtype: #positron__antielectron an elementary particle with positive charge; interaction of a positron and an electron results in annihilation
subtype: #antiparticle a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy
subtype: #antiquark the antiparticle of a quark
subtype: #hadron any elementary particle that interacts strongly with other particles
subtype: #antibaryon the antiparticle of a baryon; a hadron with a baryon number of -1
subtype: #antimeson the antiparticle of a meson
subtype: #baryon__heavy_particle__heavyparticle any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
subtype: #hyperon any baryon that is not a nucleon; unstable particle with mass greater than a neutron
subtype: #lambda_particle__lambda_hyperon an electrically neutral baryon with isotopic spin 1
subtype: #nucleon a constituent (proton or neutron) of an atomic nucleus
subtype: #antineutron the antiparticle of a neutron
subtype: #antiproton an unstable negatively charged proton; the antiparticle of a proton
subtype: #neutron an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus
subtype: #proton a stable particle with positive charge equal to the negative charge of an electron
subtype: #hydrogen_ion a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
subtype: #meson__mesotron an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
subtype: #b-meson__bmeson exceedingly short-lived meson
subtype: #J_particle__psi_particle__psiparticle a neutral meson with a large mass
subtype: #kaon__kappa-meson__kappameson__k-meson__kmeson__K_particle an unstable meson produced as the result of a high-energy particle collision
subtype: #pion__pi-meson a meson produced as the result of high-energy particle collision
subtype: #lepton an elementary particle that participates in weak interactions; has a baryon number of 0
subtype: #electron__negatron an elementary particle with negative charge
subtype: #delta_ray__deltaray an electron ejected from matter by ionizing radiation
subtype: #free_electron electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
subtype: #photoelectron an electron that is emitted from an atom or molecule by an incident photon
subtype: #valence_electron__valenceelectron an electron in the outer shell of an atom which can combine with other atoms to form molecules
subtype: #negative_muon__muon__mu-meson an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
subtype: #neutrino an elementary particle with zero charge and zero mass
subtype: #tauon__tau-minus_particle__tauminusparticle a lepton of very great mass
subtype: #quark hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3
subtype: #bottom_quark__beauty_quark a quark with a charge of -1/3 and a mass about 10,000 times that of an electron
subtype: #charm_quark a quark with an electric charge of +2/3 and a mass 2900 times that of an electron and a charm of +1
subtype: #down_quark a stable quark with an electric charge of -1/3 and a mass 607 times that of an electron
subtype: #strange_quark__strangequark__squark a quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1
subtype: #top_quark__topquark__truth_quark__truthquark a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron
subtype: #up_quark a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
subtype: #strange_particle__strangeparticle an elementary particle with non-zero strangeness
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