Final answer:
Benzene (C6H6) has a planar hexagonal structure without a central atom, making typical AXmEn notation inapplicable. However, if classified, each carbon might be considered AX2 due to two bonds.
Step-by-step explanation:
The AXmEn classification for benzene (C6H6) relates to its molecular geometry. Benzene has a planar hexagonal structure with six carbon atoms, each bonded to one hydrogen atom. There are no lone pairs on the central atoms. Since there are six bonded atoms and no lone pairs on the central atom, benzene doesn't fit any of the provided AXmEn notations, which are typically used for species with a central atom such as those in VSEPR theory. However, for classification purposes, each carbon in benzene could be considered AX2, because it is bonded to two other atoms.