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Reference.org
Heteroatom
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, a heteroatom is, strictly, any <a href="/facts/Atom/FoQ4kGN5">atom</a> that is not <a href="/facts/Carbon/ukrgQexo">carbon</a> or <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>. </p>