What can chemical formulas represent? A.) mixtures

B.) elements

C.) compounds

D.) atoms

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulae, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.

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no. dot product   =0 when vecs at right angles