no metal 28
DO NOT METAL 17 elements of the periodic table that have the lowacteristics of being very bad conductors of the electric current and be 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.
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