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Rahul Best Answer
in a complex compound, ligand acts as the molecule which can donate electrons to the central metal ion ehi acts as Lewis acid...as NH3 has a lone pair or electrons which are not used in bond formation,donates the lone pair to metal ion.. forming coordinate covalent bond..... Molecule having lone pair electrons Will act as ligand for example,NH3 is ligand as it has a lone pair of electron...whereas NH4+ ion doesn't' act as ligand as it have no lone pair....
basically im weak in this section, can you tell me how nitrogen have a loan pair in case of NH3, Nitrogen have 7 electron & H have 3 & hence their octate gets completed, then how do loan pair comes , ?
its configuration become like neon, so why any molecule like to loose inert gas like conditions by loosing electron
Valency=no. of bonds to be formed to complete it's octet. And lone pair are those electrons which don't participate in bond formation but these lone pair are responsible for their basic nature.