Chemistry / Chem 0252 · Atom · ~20 seconds
Molecular Formula
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A molecular formula lists each element's symbol in a molecule along with a subscript giving the count of that element's atoms present.
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Water's molecular formula, H2O, shows two hydrogen atoms bonded to one oxygen atom in every water molecule.
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A missing subscript always means exactly one atom of that element — no implied "1" is ever written next to a symbol.