sentences: adding one proton to an atom changes the proton number of the atom
docs: ions_of_hydrogen_atom is hydrogen_atom. electrons_protons_and_neutrons is smaller_than_atoms. atoms has electrons hydrogen_atoms has one_proton_and_one_electron hydrogen_atom has only_one_electron hydrogen_atom is atom. atomic_ion is atom. protons is component_of_atoms. proton is rocket.