One can note that the E atom electronegativity impacts on the S0 state aromaticity, and also on the total MCI value of the 3 n,* state. However, the main factor impacting on the MCI value of the 3 n,* state, relative to the S0 state, is the placement of the heteroatoms as the para-isomers always have markedly aromatic residuals (Figure ). One can also note that the increase mainly occurs in the MCI-components. Furthermore, one may expect that an increased electrostatic repulsion could lead to a more even distribution of the -electrons among atoms in the 6-MR. Yet, when regarding 9 and 17, which both are strongly aromatic in S0, and which also have strong aromatic character of the residual of the 3 n,* state, the two species have different * orbitals and their n,* states are thus of different types (B1 in 9 and A2 in 17). Hence, the type of * orbital, and accordingly, the spatial distribution, seems unrelated to the aromatic character of the residual according to MCI. For these species, we did not explore spin-separated MICD, but with NICS the situation is opposite to that of MCI because with this index compound 17 and 18 are strongly antiaromatic in their 3 n,* states (Figure ). This feature resembles that observed with NICS for 3 and stems from an extensive paratropic -contributions.