3. Answer the following questions for [FeCl2(en)2] Br a. What is the coordination number? b. Could it exhibit cis-trans isomerism (yes or no)? c. Draw a possible crystal field splitting diagram for the complex ion. Indicate whether you have drawn a high-spin or low-spin diagram.

For each d electron configuration, state the number of unpaired electrons expected in octahedral complexes. Give an example complex for each case. (Two answers are possible for some of these cases.) (a) d2 (b) d4 (c) d6 (d) d8

Which of the following statement(s) is( are) true? a. The coordination number of a metal ion in an octahedral complex ion is 8. b. All tetrahedral complex ions are low-spin. c. The formula for triaquatrianuninechromiwn(III) sulfate is [Cr(H2O)3(NH3)](SO4)3. d. The electron configuration of Hf2+ is [Xe]4f126s2. e. Hemoglobin contains Fe3+.