Atom ɗin carbon atom ɗin zarra ne na sinadarin carbon, wanda ke da protons shida a cikin tsakiya kuma yawanci yana da neutrons shida. Carbon sinadari ne mara ƙarfe kuma shine tushen duk sanannun rayuwa a duniya. Carbon atoms suna iya haɗawa da sauran ƙwayoyin halitta ta hanyar haɗin gwiwa don samar da nau'ikan kwayoyin halitta iri-iri, gami da kwayoyin halitta kamar carbohydrates, lipids, proteins, da acid nucleic.