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why do you have to use parentheses when there is more than one of the polyatomic ions when an ionic compound forms?
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why do you have to use parentheses when there is more than one of the polyatomic ions when an ionic compound forms?

User Sunil Chaudhary
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So then it will be easier for you to understand how many of the polyatomic ions you have in that compound.

For example, Ca(NO2)2: in here Ca has a charge of +2 and NO2 has -1, you need two of NO2 in order to make the compound have a charge of 0.
User Magnus Engdal
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