CIE A Level Chemistry复习笔记6.2.5 Defining Complexes

• A complex is a molecule or ion formed by a central metal atom or ion surrounded by one or more ligands
• A ligand is a species that contains one or more lone pairs of electrons
• The ligand forms a dative covalent bond with the central metal atom or ion, by donating its lone pair of electrons

Example of a complex ion formed by a central aluminium(III) ion and six water molecule ligands