|Positive ligands||Negative ligands|
The ions or molecules which surround a metal ion or metal atom are called ligands. They are attached to central metal atom or central metal ion by co-ordinate bond.
- The negative ligands whose names end with ‘ide’ have this suffix replaced by ‘O’.
Ex. Cl– (chloro) , CN– (cyano), Br– (bromo) , O— (oxo), OH– (hydroxo)
- The name of positive ligand ends with ‘ium’.
NH2NH3+ (hydrazinium), NO2+ (nitronium), NO+ (nitrosonium).