one neutron has one atomic mass unit
neutron_bomb is atomic_weapon. neutron_bomb is nuclear_weapon. neutron_bomb is not atomic_weapon. neutron_bomb is weapon_of_mass_destruction. neutronium is neutron_matter. neutrons has about_as_much_mass_as_protons hydrogen_atoms has one_proton_and_one_electron neutrons has not about_as_much_mass_as_protons hydrogen has atomic_number_of_one hydrogen_atom has only_one_electron