How do polyatomic ions bond?

| May 7, 2018

are covalently bonded within the ion, but they form ionic bonds to other ions.
The only difference between a molecule and an ion is the number of .
Since molecules are covalently bonded, their polyatomic ions are also covalently bonded.
For example, in the Lewis structure of sulfate ion, ##”SO”_4^”2-“##, the bonds between the S and O atoms are all covalent.
Once the sulfate ion, ##”SO”_4^”2-“## has formed, it can form ionic bonds by electrostatic attractions to positive ions such as ##”Na”^+## and form the ionic compound ##”Na”_2″SO”_4##.

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