Ligand with two or more points of attachment to single metal atoms are called

Ligand which have two doner sites (atoms) but at a time only one site (atom) donates are known as ambidentate ligand.Unidentate ligands: Ligands which have only one e- donor atom.Bidentate ligands: Ligands which have two donor atoms and have the ability to link with central metal ion at two positions are called bidentate ligands.Polydentate ligand forms atleast four member rings with central metal ion show chelation. These ligands are known as chelating ligand.