Predict whether the following octahedral complexes are high spin or low spin, and given your prediction, give the number of unpaired electrons in each.

Strategy Use a combination of the location in the spectrochemical series of the ligands, the charge on the metal, and the row in which the metal is located on the periodic table to predict the magnitude of Δ. If Δ is large, the complex will be low spin; if it is small, then it will be high spin.