Who do we know valence of polyatomic ion
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Add together the oxidation numbers of all the atoms in the polyatomic ion. The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell
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Add together the oxidation numbers of all the atoms in the polyatomic ion. The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell.
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