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The ground state electronic configuration of the Co(III) ion in [Co(ox)₃]⁴⁻ is d⁶. The oxalate ligand (ox) is a weak field ligand, meaning it causes a small splitting of the d orbitals. Therefore, the ground state term symbol is ⁴A₂g. This is determined using Hund's rules and the Tanabe-Sugano diagram for d⁶ complexes.