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Carbon is present in all organic compounds and organic compounds are found throughout living organisms. Since an onion is a plant made of cells, yes, onions contain molecules comprised of carbon. It's unlikely though that there is elemental carbon present (just carbon, not in a compound).
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoO and H because there is water in it.
C because it is organic (contains fat, protein, etc.).
An onion also contains K, Mg, Ca.
Wiki User
∙ 13y agoNowhere. Onions are a vegetable, not an element.
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