Which atoms from EDTA are used to bind to metal ions during formation of complex?

Step-by-step solution

EDTA (Ethylenediaminetetraacetate) is a hexadentate ligand. Its chemical structure contains two nitrogen atoms and four carboxylate groups. During the formation of a complex with a metal ion, it donates electron pairs from the two nitrogen atoms and the four oxygen atoms of the carboxylate groups. Thus, four oxygen and two nitrogen atoms are used to bind to metal ions. Answer: Four oxygen and two nitrogen atoms