how to take out a formula how to know which elements substitute the compound
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Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol.
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Elements that are likely to form cations—usually metals or hydrogen gas—will replace the cation in a compound, and elements that are likely to form anions—usually group 17 halogens—will replace anions in a compound. A higher ranked element in the activity series is more reactive in a single replacement reaction.
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