Ethylene diaminetetraacetate (EDTA) ion is :
Hexadentate ligand with four "O" and two "N" donor atoms
Unidentate ligand
Bidentate ligand with two "N" donor atoms
Tridentate ligand with three "N" donor atoms
The structure of EDTA is -
It is a Hexadentate ligand with four "O" and two "N" donor atoms.
Therefore, the correct option is (1).