The crystalline actinide cluster isolated by Boronski et al. represents an interesting and important case in which the cyclic delocalization of electrons inside the all-metal core is not associated with aromatic stabilization, but is dictated by the symmetry of the network of the surrounding bonds. In fact, the charge transfer between thorium and chlorine atoms makes the multicenter charge-shift bonding in the Th3Cl6 cage particularly strong, but at the same time it impairs the direct σ-bonding of Th atoms to the extent in the Th3 ring (D3h) exhibits no extra stabilization compared to its linear and more localized isomer (C∞v). Thus, in accordance with the very first sentence of the recommendation by IUPAC ('Aromaticity is the concept of spatial and electronic structure of cyclic molecular systems displaying the effects of cyclic electron delocalization which provide for their enhanced thermodynamic stability relative to acyclic structural analogues (…)'), the trithorium ring cannot be classified as σ-aromatic. The results presented in this and previous studies suggest that actinide atoms are simply too heavy (with the valence electrons bonded too weakly) to form strong covalent σ-bonds with their 6d orbitals, and consequently the superposition of the resonance forms containing such bonds is expected to bring rather marginal extra stabilization to the system, if any. This fact may have broader implications for not only clarifying the limits of aromaticity on the periphery of the periodic table, but also for understanding the chemistry of actinides and future attempts to design and synthesize stable actinide complexes. Finally, the presented results demonstrate that the aromatic stabilization effect in small rings increases almost linearly with the ionization level. Consequently, the results of previous theoretical investigations involving ionized model clusters like Th3 10+ and Th3Cl6 4+ cannot be used to justify aromaticity in the crystalline cluster isolated by Boronski et al.