sumo#subatomic_particle__subatomicparticle  the class of elemental_substances that are smaller than atoms and compose atoms
  supertype:  sumo#elemental_substance  pure_substances that cannot be separated into two or more substances by ordinary chemical (or physical) means; this excludes nuclear reactions; elemental_substances are composed of only one kind of atom, e.g., iron (Fe), copper (Cu), and oxygen (O_2); elemental_substances are the simplest pure_substances
  subtype:  sumo#atomic_nucleus  the core of the atom; it is composed of protons and neutrons
  subtype:  sumo#electron  sumo#subatomic_particles that surround the atomic_nucleus; they have a negative charge
  subtype:  sumo#proton  components of the atomic_nucleus; they have a positive charge
  subtype:  sumo#neutron  components of the atomic_nucleus; they have no charge

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