At 480 nm, the ion, [Cr(CN)₆]^3-, displays one absorption peak. Determine its crystal field splitting energy, Δ (kJ/mol), and the color of that ion. Is CN^- a stronger or weaker field ligand compared to NH₃?

Δ = 230 kJ/mol; the color is green; CN^- is a stronger field ligand than NH₃

Δ = 240 kJ/mol; the color is blue; CN^- is a weaker field ligand than NH₃

Δ = 250 kJ/mol; the color is orange; CN^- is a stronger field ligand than NH₃

Δ = 260 kJ/mol; the color is yellow; CN^- is a weaker field ligand than NH₃