The correct ground state electron configuration for Ni²⁺ is:

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The electron configuration for Ni is [Ar]3d8 4s2. Sulfur has an electron configuration of [Ne]3s2 3p4, and phosphorus has an electron configuration of [Ne]3s2 3p3. Sulfur will donate one electron to Ni to form the sulfide ion, S2-. Phosphorus will donate three electrons to form the phosphide ion, P3-. The electron configuration of S2- is [Ne]3s2 3p6, and the electron configuration of P3- is [Ne]3s2 3p6. The electron configuration of Ni2+ is [Ar]3d8. Putting all of this together, the electron configuration for Ni²⁺ is: [Ar]3d8 (from Ni2+) 3p6 (from S2-) 3p6 (from P3-) 3d10 (from Ni) = [Ar]3d10 4s0 3p6 = [Ar]3d10 3p6. Simplifying further, we get [Ar]3d10⁸.

The Correct Ground State Electron Configuration for Ni2+ Is

The Correct Ground State Electron Configuration for Ni²⁺ Is