No METAL typographical error by NO METAL 16 elements of the periodic table that have the caeacteristic of being very bad conductors of the electric current and being very weak so they can neither be laminated nor made wire . They are : monovalent Fluor, chlorine, bromine, iodine, cyanogen; bivalents : oxygen, selenium, teluro, sulfur; trivalents : nitrogen, phosphorus, arsenium, antimony and boron; quadrigvalents: carbon, silicon and germanium.
