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A subscript or superscript is a number, figure, symbol, or indicator that is smaller than the normal line of type and is set slightly below or above it.
In a compound, the subscript appears after the end parentheses. For instance, in Ca(NO3) 2, the two is the subscript. It represents that two nitrates are present in the compound calcium nitrate. Subscripts cannot be changed in a compound's chemical makeup. If the subscript is changed, it is no longer the chemical it originally represented. When dealing with polymers, the subscript can sometimes be a letter. Learn more about Chemical Equations