#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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