The ions or molecules which surround a metal ion or metal atom are called ligands which are attached to a central metal atom or central metal ion by a co-ordinate bond.
In order to be a ligand, any molecule or ion should possess at least one lone pair or a bond pair that can be shared with a central metal ion.
The ionic ligands can be divided into the following two categories: Negative ligands and Positive ligands
Negative ligands:
Ligands that carry a negative charge or anion and usually contain suffixes like ‘ite’ or ‘ate’ which are further replaced by ‘O’ are called negative ligands.
List of examples for Negative ligands:etc.
Positive ligand:
The ligand ligands that carry a positive charge or cation and usually contain suffixes like ‘ium’ is called the positive ligand.
List of examples of positive ligands:,and etc.
Hence, these are the given list of positive and negative ligands.