CH1012
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LIGANDS I
LIGAND TYPES
• A potential ligand must have an atom with an unshared pair of electrons suitable for bond formation with the central metal ion. 
• The donor atoms in the ligand are those with available electron density
ie. the more electronegative elements, on the right hand side of the Periodic Table.
• A ligand may be neutral (e.g. the ammonia molecule, NH3) or charged (e.g. the chloride ion, Cl-).