What is meant by unidentate , didentate and ambidentate ligands . give two example of each

What is meant by unidentate , didentate and ambidentate ligands . give two example of each
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When a legend is bound to a metal ion through a single diner atom, is said to be unidentate for ex- Cl- , H2O & NH3 When a legande can bound through two donor atoms as in H2N CH2 CH2NH2, or C2 O4 (oxalate) is said to be didentate legend. When several donor atoms are present in a single ligand, the ligand is said to be polydentate ligand which can ligate through two different atoms is called ambidenate ligand Ex-NO2, SCN 
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