proton is a kind of subatomic particle
monoatomic_cation is atomic_ion. ions_of_hydrogen_atom is monoatomic_cation. subatomic_particle is natural_inanimate_thing. hydrogen_ion is proton. alpha_particle is subatomic_particle. subatomic_particle is microscopic_object. protons is component_of_atoms. proton is rocket. beta_particle is subatomic_particle. subatomic_particle is spatial_thing.