Monovalent Metals: Lithium , Sodium, Potassium, Silver , Divalent Metals: Calcium, Magnesium, Lead, Mercury, Zinc, Trivalent Metals: Aluminum, Gold, Monovalent Non-Metals: Hydrogen, Chlorine, Bromine, Fluorine, Iodine, Divalent Non-Metals: Oxygen, Trivalent Non-Metals: Nitrogen , Tetravalent Non-Metals: Carbon,

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