These look fine, except that Ni2+ ion exists as the bright green hexaaqua complex in aqueous solution, [Ni(H2O)6]2+. Nickel also forms four-coordinate complexes, such as the tetrahedral [NiCl4]2- ion and the square planar [Ni(CN)4]2- ion. The latter is the more common geometry for four-coordinate d8 transition metal complexes, and may be the reason your textbook may have assumed this to be the case for the Ni2+(aq) ion also. Steve |
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