Given the species, we need to determine which have the same magnetic moment by counting their unpaired electrons. For the species Cr2+ and Mn3+, both have the same number of unpaired electrons: Number of unpaired electrons, n=4 The magnetic moment µ is calculated using the formula: µ=√n(n+2)=√4(4+2)=√24‌BM Thus, Cr2+ and Mn3+ have the same magnetic moment.