Approximately two thirds of all compounds that were known at the end of last century are fully or partially aromatic, and about half are heteroaromatic. The latter find applications in a wide array of areas including pharmaceutical chemistry, agrochemistry, and organic electronics. Thus, it is important to understand their electronic structures, and this applies to their singlet ground states (S0) as well as the first electronically excited states of singlet and triplet multiplicities (S1 and T1), where the latter states normally determine the photophysical and photochemical features. One characteristic is their extent of (anti)aromaticity, and in the lowest * excited states, (anti)aromaticity is often given by Baird's rule. This rule tells that annulenes with 4n -electrons are aromatic in these states while those with 4n+2 are antiaromatic. However, this form of excited state (anti)aromaticity is not valid for heteroaromatics with n,* states as S1 and/or T1 states, e.g., pyrazine and s-triazine. Thus, how to assess and rationalize the potential aromatic or antiaromatic character of the n,* states of heteroaromatics? Does the (anti)aromatic character influence which state is the lowest in energy, the n,* or the ,* state?