sentences: zero proton has 1 atomic want dissociate
docs: photons has zero_rest_mass atomic_nucleus is microscopic_object. zero is integer. hydrogen_atoms has one_proton_and_one_electron zero is set_containing_one_element. hydrogen has atomic_number_of_one fission_bomb is atomic_weapon. neutrons has about_as_much_mass_as_protons atoms has mass trivial_zero_divisor is zero_divisor.