EDTA⁴⁻ acts as which type of ligand when fully coordinated to a metal ion?

1. Your syllabus calls EDTA⁴⁻ an important hexadentate ligand. 2. It binds through two nitrogen atoms and four oxygen (carboxylate) atoms. 3. All six donor atoms bond simultaneously to one central metal. 4. This chelate structure gives EDTA complexes high stability. _Source: syllabus Chemistry, Unit 5 "Coordination Compounds", §5.2(c)_