How does the periodic table tell you the subscripts for elements in chemical formulas?
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Representing Compounds. In a chemical formula, the elements in a compound arerepresented by their chemical symbols, and the ratio of different elements is represented by subscripts. ... The subscript2 after the H shows that there are two atoms of hydrogen in the molecule. The O for oxygen has no subscript.
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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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