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CH1012
BONDING
• Most d- T-Metal ions have vacant d-orbitals that can accept a share of an electron pair, and as a result many act as Lewis acids by forming coordinate-covalent bonds. 
• The bonding in metal complexes can be simplified to say that most T-Metal ions are potential Lewis acids and most ligands are potential Lewis bases. 
• Accordingly, metal complexes are often called coordination compounds as they
contain coordinate-covalent bonds.