| | Constants | Periodic Table A complex ion is a species in which a central metal ion is attached to a group of surrounding ions or molecules by coordinate covalent bonds. The surrounding species are called ligands. Within a ligand, the atoms that are directly attached to the metal ion (or atom) are called donor atoms. Most ligands contain a single donor atom (monodentate), but some contain two donor atoms (bidentate), six donor atoms (hexadentate), or another combination of donor atoms. A complex ion that is associated with one or more counter ions is called a coordination compound. For example [PdCl4]2âis a complex ion, and Na[PdCl4] is a coordination compound. The following table lists some common ligands. | Ligand | Number of
donor atoms | | Clâ | 1 | | Fâ | 1 | | Brâ | 1 | | CO32â | 2 | | CNâ | 1 | | glyâ | 2 | | EDTA4â | 6 | | NH3 | 1 | | H2O | 1 | | CO | 1 | The coordination number for a complex is the total number of donor atoms surrounding the central atom. The overall charge on a complex is the sum of the charges of the metal and all the ligands. | Part A What is the coordination number for each of the following complexes or compounds? [Co(NH3)4Cl2]+ [Cr(EDTA)]â [Zn(H2O)4]2+ Na[Ag(CN)2] Enter the coordination numbers, in the order that the complexes are listed, as four integers separated by commas (e.g., 1,2,3,4). View Available Hint(s) Submit Part B What is the charge on each of the following complex ions? hexaaquamanganese(II), [Mn(H2O)6]? tris(carbonato)aluminate(III), [Al(CO3)3]? amminepentachloroplatinate(IV), [Pt(NH3)Cl5]? Express the charges numerically, in the order that the complexes are listed, separated by commas. For a nonzero charge, be sure to include the sign (e.g., +1,-2,+3). View Available Hint(s) Submit Part C What is the oxidation number of the central metal ion in each of the following complexes or compounds? [NiCl2Br2]2â [Cr(H2O)2(NH3)4]3+ Na[Au(CN)2] Express the oxidation numbers numerically, in the order that the complexes are listed, separated by commas. For a nonzero oxidation number, be sure to include the sign (e.g., +1,-2,+3). View Available Hint(s) Submit |
