What are subscripts used for in writing chemical equations?
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Chemical formulas use letters and numbers to represent chemical species (i.e., compounds, ions). ... The numbers appearing as subscripts in the chemical formula indicate the number of atoms of the element immediately before the subscript. If no subscript appears, one atom of that element is present.
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To write the formula of a binary molecular compound, first use the prefixes in the name to tell you the subscript of each element in the formula. Then, write the correct symbols for the two elements with the appropriate subscripts.
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