Question

which of the following elements does not form more than one ion? zn ni pb au

Explanation:

• Zn (Zinc): Zinc typically forms only one ion, \(Zn^{2 +}\).
• Ni (Nickel): Nickel can form \(Ni^{2+}\) and \(Ni^{3+}\) ions.
• Pb (Lead): Lead can form \(Pb^{2+}\) and \(Pb^{4+}\) ions.
• Au (Gold): Gold can form \(Au^{+}\) and \(Au^{3+}\) ions.

Answer:

Zn