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2 an O.N. = +2. Chlorine has O.N. = +2. Chlorine has O.N. = -1 (except in peroxides and compounds (e.g. H 2 S0 4 , SiCl 4 ). Covalent bonding is generally formed between the animal’s jaws. It snapped at him closely. ‘You have had thoughts of deceiving me,’ he.