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Question
How to find the valency of a polyatomic ion??
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Solution
Finding the valency of polyatomic ions are very easy.
The valencies of the constituent atoms are combined.
For example, the polyatomic ion, carbonate, has a formula of CO3. the valence state of oxygen ions is -2 (it’s in Group 16 of the periodic table, two to the left of Group 18, the noble gases: 16–18 = -2). There are 3 oxygen atoms in the polyatomic ion, so the oxygen atoms contribute -6 to the valency of the polyatomic ion. The one carbon atom has a valency of 4+. The overall charge on the carbonate ion is -6 +4 = -2. So carbonate has a charge of -2.
If the polyatomic ion has a charge, then the charge itself is the valency,
ie;
in the case of [MnO4]2- ion ,the valency is -2
The valencies of the constituent atoms are combined.
For example, the polyatomic ion, carbonate, has a formula of CO3. the valence state of oxygen ions is -2 (it’s in Group 16 of the periodic table, two to the left of Group 18, the noble gases: 16–18 = -2). There are 3 oxygen atoms in the polyatomic ion, so the oxygen atoms contribute -6 to the valency of the polyatomic ion. The one carbon atom has a valency of 4+. The overall charge on the carbonate ion is -6 +4 = -2. So carbonate has a charge of -2.
If the polyatomic ion has a charge, then the charge itself is the valency,
ie;
in the case of [MnO4]2- ion ,the valency is -2
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