Question

Can any one tell me that can we find valency of polyatomic ions or we have to learn it?​

Answer 1

Answer:

For example, the polyatomic ion, carbonate, has a formula of CO3. ... 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.

Answer 2

Answer:

No this question answer you have to learn it