Which of the following metal ions can have coordination numbers of either 4 or 6? A) Ag⁺ B) Ca²⁺ C) Cu⁺ D) Ni²⁺ E) Au⁺

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Nickel (Ni) is able to form coordination complexes with either 4 or 6 ligands due to its ability to accommodate different geometries. This property, along with its relatively stable +2 oxidation state, make it a common transition metal used in coordination chemistry. The other options listed either do not have the ability to form coordination complexes with both 4 and 6 ligands, or are not transition metals.

Which of the Following Metal Ions Can Have Coordination Numbers