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There is one element in a compound for each of the distinct* atomic symbols in a properly written formula for the compound (not element!); in this instance, three elements: potassium, oxygen, and hydrogen.

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*In some compounds, an atomic symbol occurs more than once; for example, the formula for ammonium nitrate is NH4NO3, but the two occurrences of "N" represent the same element.

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12y ago

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