Final answer:
The complete ground-state electron configuration of V³⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d².
Step-by-step explanation:
The complete ground-state electron configuration of V³⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d². When V (vanadium) loses 3 electrons to form a +3 ion, it loses the 4s² electrons first and then the 3d² electrons. This leaves the configuration with only the 1s, 2s, 2p, 3s, and 3p orbitals filled.