molecule of hydrogen and chlorine have single covalent bond between their atom while oxygen has a double covalent bond and nitrogen has four single covalent bond .
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Chlorine and Hydrogen both have a valency of 1 so they can gain or share 1 electron to complete their valence shell. Therefore they form single bonds. Oxygen has valency of 2 so it can gain or share 2 electrons to complete its valence shell.
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