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It is similar to the subscript next to an element, it indicates how many of the group or polyatomic ion in parentheses are present in the formula.

As an example, calcium hydroxide is Ca(OH)2 The subscript indicates that this formula contains two hydroxide ions.

A numerical subscript following a set of parentheses represents the number of the group or poly-atomic ion in parentheses are present in a chemical  formula.

As an example, calcium hydroxide is [tex]\bold { Ca(OH)_2 }[/tex] . The subscript (2) indicates that calcium hydroxide contains two hydroxide ions.

Therefore, A numerical subscript following a set of parentheses represents the number of the group or poly-atomic ion in parentheses are present in a chemical  formula.

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