#nucleon  a constituent (proton or neutron) of an atomic nucleus
  supertype:  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:  antineutron  antiproton  neutron  proton
  part of:  nucleus__nucleu  the positively charged dense center of an atom
     part of:  atom  (physics and chemistry) the smallest component of an element having the chemical properties of the element
        part of:  chemical_element__element  any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
        part of:  molecule  (physics and chemistry) the simplest structural unit of an element or compound

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