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Oxalate (C2O4^2-) and ethylenediamine (en) are both strong field ligands, but en is generally considered a stronger field ligand than oxalate. This is because en is a bidentate ligand, meaning it can bind to a metal ion at two points, while oxalate is a bidentate ligand as well but with a weaker binding affinity due to the presence of two carboxyl groups. The greater the number of donor atoms and the stronger the donor atom's ability to donate electrons, the stronger the ligand field. The strength of the ligand field can impact the properties of the metal complex, including its color, magnetic properties, and reactivity.