To calculate the magnetic moment of a tetrahedral complex with four ligands, each containing one unpaired electron, coordinated to a central transition metal ion with a d electron configuration, we first need to determine the total number of unpaired electrons in the complex.For the central transition metal ion with a d electron configuration, there are 4 unpaired electrons.For the four ligands, each containing one unpaired electron, there are 4 unpaired electrons in total.So, the total number of unpaired electrons in the complex is 4 from the central metal ion + 4 from the ligands = 8 unpaired electrons.The magnetic moment can be calculated using the formula: = n n+2 where n is the number of unpaired electrons.In this case, n = 8, so: = 8 8+2 = 8 10 = 80 The magnetic moment of the tetrahedral complex is 80 Bohr magnetons.