For octahedral metal cmplxs of the type MA3B3 (A and B monodentate ligands) there are only two geometric isomers, namely, the fac (facial) and mer (meridinal) isomers Solution For octahedral metal cmplxs of the type MA3B3 (A and B monodentate ligands) there are only two geometric isomers, namely, the fac (facial) and mer (meridinal) isomers.