explain why it is appropriate to group a polyatomic ion in parentheses in a chemical formula, if more than one of that ion is present in the formula

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Explanation:

It is commonplace to put polyatomic ions in parenthesis when they are more than one in a compound. A typical example here is calcium phosphate- Ca3(PO4)2.

When a compound contains more than a single polyatomic ion of the same type,a parentheses is placed  around the formula of that ion then a subscript is used to indicate how many  of that particular ion are in the compound.

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