one proton has one atomic mass unit
atomic_mass is not mass. h is atomic_nucleus. hydrogen_atoms has one_proton_and_one_electron atomic_mass_unit is mass_unit. atomic_mass is mass. hydrogen has atomic_number_of_one hydrogen_atoms has not one_proton_and_one_electron hydrogen_atom has only_one_electron hydrogen has not atomic_number_of_one atomic_mass_unit is not mass_unit.