An atom in a molecule that is not carbon or hydrogen, such as nitrogen, oxygen, sulfur, or phosphorus.
From hetero- (different) + atom. The prefix hetero- comes from Greek heteros meaning 'other' or 'different,' emphasizing that these atoms differ from the typical carbon-hydrogen backbone of organic molecules.
Heteroatoms are the secret ingredient that makes organic chemistry so diverse—without them, you'd only get simple carbon and hydrogen compounds, but add just one oxygen or nitrogen and you unlock thousands of new molecules with completely different properties.
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